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Get a 301 area code local phone number
Unlock the power of local connectivity with advanced features designed for businesses aiming to flourish in the 301 area code region. Our virtual phone system marries professionalism, collaboration, and simplicity, crafting a comprehensive solution for your communication needs.
Secure 301 area code numbers with Teloz! 📞
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Boost Your Business Presence in 301 area code
- Local Credibility: Strengthen your footprint in the 301 area code, showing potential customers your commitment to the local community.
- Market Penetration: Seamlessly blend into the regional market, making your services more attractive to residents.
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ZIP Code Served By 301 area code
Professionalism and Collaboration Features
Custom Greetings & Multi-Level Menus
Greet callers with tailored messages and navigate them through your services smoothly, showcasing your business’s professionalism.
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Enable your team with shared inboxes and collaboration tools, ensuring you remain connected and attentive to customer inquiries.
How It Works: Streamline Your Setup
- Select Your 301 Area Code Number: Choose from a variety of numbers that resonate with your business identity.
- Download the App or Access via Web Browser: Utilize our platform on your chosen devices, offering both flexibility and ease of use.
- Initiate Connections: Dive into calling and texting within minutes, enhancing your interactions with local customers.
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Smooth Number Porting, Affordable Global Calls, and Seamless Device Compatibility
Number Porting
Easily transition your current number to our system, ensuring a seamless changeover.
International Calls
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Device Compatibility
Our system is optimized for seamless operation across all your devices, keeping you connected wherever you go.
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Flexible Commitments
Relish the liberty of our month-to-month subscriptions, tailored for the evolving needs of your business.
Round-the-Clock Support
Benefit from our dedicated support team, available 24/7 to assist with any queries or issues.
Adaptable Solutions
Modify your services as your business landscape changes, with scalable features and plans that grow alongside you.
Security and Trust
Encryption & Compliance
Confidence in your communication security, backed by end-to-end encryption and strict adherence to premier security protocols.
Continuous Updates
Stay protected with frequent updates, ensuring your communication system remains robust against evolving threats.
How to Obtain a 301 area code Phone Number
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Pricing: Choose Your Perfect Plan
Unlock the full potential of your business communication in the 315 area code with our flexible pricing plans. Designed to cater to businesses of all sizes, our plans ensure you only pay for what you need, with the option to adjust as your business grows.
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Starter Plan
Essential for personal projects
$8.99
$3.99
Per month / user
Get started with essential features like unlimited calling and texting within the 301 area code, voicemail transcription, and basic CRM integration.
All advanced telephony features
- 1 Users Minimum
- Unlimited Calling
- Unlimited Message
- 1 Business phone number
- Click to Call
Professional Plan
Enhanced for Growing Teams
$7.99
$2.99
Per month / user
Includes everything in the Starter Plan plus advanced features such as custom greetings, multi-level menus, shared inboxes, and enhanced CRM integration.
All Small Team features, plus
- 5 Users Minimum
- Live Call Monitoring
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Custom Solutions for Large Enterprises
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Per month flat free
Tailored to fit your business needs with premium features, including dedicated support, custom analytics, and enterprise-grade security.
All Business features, plus
- Unlimited Users
- Unlimited Minutes
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- Get Volume Discount
Each plan comes with a free trial period, allowing you to experience the benefits first-hand before making a decision. Plus, with no long-term contracts, you have the flexibility to switch plans or cancel at any time. Start enhancing your local presence in the 301 area code today!
Why Partner with Us?
We pride ourselves on offering a secure, adaptable, and feature-rich virtual phone system, distinctively designed for businesses targeting the 301 area code region. With no requirement for long-term contracts, a dedication to superior customer service, and a platform that adapts to your business’s growth, we’re committed to propelling your success. Begin with our free trial and discover the transformative impact on your business communication today.
State & Area Codes
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📞 Unlock Your Business's Potential in the 301 Area Code Today!
- Start connecting with your local community like never before.
- Choose our virtual phone system for unparalleled professionalism and collaboration.
- Sign up now for our free trial and experience the immediate difference in your business communication.
No long-term commitments, just seamless connectivity.
Provide a compilation of all the area codes in maryland
212
315
332
347
516
518
585
607
631
680
716
838
845
914
917
929
934
Provide A Compilation Of All The Area Codes
State & area Codes
State
Area Code
Active Phone Number Prefixes( NXX)
for maryland area code
| NPA | NXX | CITY | USAGE | COMPANY NAME | NXX INTRODUCED DATE |
|---|---|---|---|---|---|
| 301 | 200 | Indian Head | Landline | Bandwidth.com Clec, Llc - Md | 2/24/2011 |
| 301 | 202 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 12/19/2008 |
| 301 | 202 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 12/19/2008 |
| 301 | 203 | Accokeek | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 203 | Clinton | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 203 | Fort Washington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 204 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 4/15/1996 |
| 301 | 204 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 4/15/1996 |
| 301 | 205 | Edgewater | Landline | Verizon Maryland, Inc. | 7/6/1997 |
| 301 | 205 | Riva | Landline | Verizon Maryland, Inc. | 7/6/1997 |
| 301 | 205 | Annapolis | Landline | Verizon Maryland, Inc. | 7/6/1997 |
| 301 | 206 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 207 | Riverdale | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 207 | College Park | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 207 | Greenbelt | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 208 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 208 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 209 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 209 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 209 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 210 | Beltsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 210 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 212 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 212 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 213 | Beltsville | Wireless | Sprint Spectrum L.p. | 7/6/1997 |
| 301 | 213 | Laurel | Wireless | Sprint Spectrum L.p. | 7/6/1997 |
| 301 | 214 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 214 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 214 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 215 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 215 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 216 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 216 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 217 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 218 | Upper Marlboro | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 218 | Bowie | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 219 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 7/4/1995 |
| 301 | 219 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 7/4/1995 |
| 301 | 220 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 220 | College Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 220 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 221 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 9/11/1994 |
| 301 | 221 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 9/11/1994 |
| 301 | 222 | Bethesda | Landline | Cavalier Telephone Mid-atlantic, Llc - Md | 10/11/1997 |
| 301 | 222 | Chevy Chase | Landline | Cavalier Telephone Mid-atlantic, Llc - Md | 10/11/1997 |
| 301 | 223 | Williamsport | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 224 | Bethesda | Wireless | Usa Mobility Wireless, Inc. | 4/15/1996 |
| 301 | 224 | Chevy Chase | Wireless | Usa Mobility Wireless, Inc. | 4/15/1996 |
| 301 | 225 | Glenn Dale | Landline | Teleport Communications America, Llc - Dc | 5/21/2009 |
| 301 | 225 | Lanham | Landline | Teleport Communications America, Llc - Dc | 5/21/2009 |
| 301 | 225 | Bowie | Landline | Teleport Communications America, Llc - Dc | 5/21/2009 |
| 301 | 226 | Lanham | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 226 | Hyattsville | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 227 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 227 | Glen Echo | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 228 | Frederick | Landline | Verizon Maryland, Inc. | 7/6/1997 |
| 301 | 229 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 229 | Glen Echo | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 230 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 231 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 232 | Sandy Spring | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 232 | Ashton | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 232 | Brinklow | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 233 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 4/1/1997 |
| 301 | 234 | Temple Hills | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 234 | Fort Washington | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 234 | Oxon Hill | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 235 | Clinton | Landline | Mcimetro Access Transmission Services Llc | 1/11/1997 |
| 301 | 235 | Cheltenham | Landline | Mcimetro Access Transmission Services Llc | 1/11/1997 |
| 301 | 235 | Andrews Air Force Base | Landline | Mcimetro Access Transmission Services Llc | 1/11/1997 |
| 301 | 236 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 236 | Spencerville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 237 | Beltsville | Wireless | Sprint Spectrum L.p. | 4/1/1997 |
| 301 | 237 | Laurel | Wireless | Sprint Spectrum L.p. | 4/1/1997 |
| 301 | 238 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 238 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 238 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 239 | Hyattsville | Wireless | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 239 | Bladensburg | Wireless | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 239 | Riverdale | Wireless | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 240 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 240 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 241 | Cascade | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 242 | Brandywine | Landline | Mcimetro Access Transmission Services Llc | 1/11/1997 |
| 301 | 243 | Bethesda | Landline | Verizon Maryland, Inc. | 7/20/2006 |
| 301 | 243 | Chevy Chase | Landline | Verizon Maryland, Inc. | 7/20/2006 |
| 301 | 244 | Rockville | Landline | Telcove Operations, Inc. - Md | 1/11/1997 |
| 301 | 245 | Bittinger | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 246 | Nanjemoy | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 247 | Leonardtown | Wireless | New Cingular Wireless Pcs, Llc - Dc | 1/10/1996 |
| 301 | 248 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 248 | Fort Washington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 248 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 249 | Upper Marlboro | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 249 | Bowie | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 250 | Gaithersburg | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 250 | Montgomery Village | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 251 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 252 | Gaithersburg | Wireless | Sprint Spectrum L.p. | 1/10/1996 |
| 301 | 252 | Montgomery Village | Wireless | Sprint Spectrum L.p. | 1/10/1996 |
| 301 | 253 | Damascus | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 254 | Beltsville | Wireless | Sprint Spectrum L.p. | 1/10/1996 |
| 301 | 254 | Laurel | Wireless | Sprint Spectrum L.p. | 1/10/1996 |
| 301 | 255 | Rockville | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 256 | Laurel | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 257 | Beltsville | Wireless | Sprint Spectrum L.p. | 10/11/1997 |
| 301 | 257 | Laurel | Wireless | Sprint Spectrum L.p. | 10/11/1997 |
| 301 | 258 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 258 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 259 | Issue | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 259 | Newburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 259 | Chaptico | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 260 | Ashton | Landline | Verizon Maryland, Inc. | 7/6/1997 |
| 301 | 261 | Glenn Dale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 261 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 261 | Bowie | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 262 | Glenn Dale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 262 | Bowie | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 263 | Bethesda | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 263 | Glen Echo | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 264 | Mount Savage | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 265 | Temple Hills | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 265 | Fort Washington | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 265 | Oxon Hill | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 266 | Waldorf | Wireless | New Cingular Wireless Pcs, Llc - Dc | 1/11/1997 |
| 301 | 267 | Riverdale | Wireless | Sprint Spectrum L.p. | 10/4/2011 |
| 301 | 267 | College Park | Wireless | Sprint Spectrum L.p. | 10/4/2011 |
| 301 | 267 | Greenbelt | Wireless | Sprint Spectrum L.p. | 10/4/2011 |
| 301 | 268 | Cumberland | Wireless | Uscoc Of Cumberland, Inc. Dba United States Cel Md | 7/6/1997 |
| 301 | 269 | Takoma Park | Landline | Mcimetro Access Transmission Services Llc | 11/11/2014 |
| 301 | 269 | Hyattsville | Landline | Mcimetro Access Transmission Services Llc | 11/11/2014 |
| 301 | 269 | Mount Rainier | Landline | Mcimetro Access Transmission Services Llc | 11/11/2014 |
| 301 | 270 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 270 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 271 | Thurmont | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 272 | Bethesda | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 272 | Chevy Chase | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 273 | Silver Spring | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 274 | Hughesville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 275 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/11/1995 |
| 301 | 275 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/11/1995 |
| 301 | 276 | Hyattsville | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 276 | Mount Rainier | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 276 | Brentwood | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 277 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 277 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 277 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 278 | Mount Rainier | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 278 | Oxon Hill | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 278 | Brentwood | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 279 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 280 | Bethesda | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 280 | Chevy Chase | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 281 | Temple Hills | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 281 | Fort Washington | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 281 | Oxon Hill | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 282 | Silver Spring | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 282 | Burtonsville | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 283 | Accokeek | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 283 | Pomfret | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 283 | Bryans Road | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 284 | Rockville | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 284 | Derwood | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 285 | Silver Spring | Wireless | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 285 | Takoma Park | Wireless | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 286 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 286 | College Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 286 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 287 | Silver Spring | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 287 | Bethesda | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 287 | Kensington | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 288 | Rockville | Landline | Mci Worldcom Communications, Inc. - Md | 1/10/1996 |
| 301 | 289 | Takoma Park | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 289 | Hyattsville | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 289 | Mount Rainier | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 290 | Mechanicsville | Landline | Verizon Maryland, Inc. | 7/6/1997 |
| 301 | 291 | Hyattsville | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 291 | Mount Rainier | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 291 | Brentwood | Landline | Mci Worldcom Communications, Inc. - Md | 1/11/1997 |
| 301 | 292 | Accokeek | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 292 | Clinton | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 292 | Fort Washington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 293 | Myersville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 294 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 295 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 295 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 295 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 296 | Rockville | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 296 | Derwood | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 297 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 297 | Fort Washington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 297 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 298 | Upper Marlboro | Landline | Mcimetro Access Transmission Services Llc | 4/1/1997 |
| 301 | 298 | Lothian | Landline | Mcimetro Access Transmission Services Llc | 4/1/1997 |
| 301 | 299 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 299 | Potomac | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 299 | Cabin John | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 300 | Bethesda | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 3/30/2007 |
| 301 | 300 | Chevy Chase | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 3/30/2007 |
| 301 | 302 | Hagerstown | Wireless | Sprint Spectrum L.p. - Md | 10/5/2004 |
| 301 | 303 | Riverdale | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 303 | College Park | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 303 | Greenbelt | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 304 | Frederick | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 3/6/2007 |
| 301 | 305 | Frederick | Wireless | Sprint Spectrum L.p. | 4/15/1996 |
| 301 | 306 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 306 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 306 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 307 | Riverdale | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 307 | College Park | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 307 | Greenbelt | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 308 | Riverdale | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 308 | College Park | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 308 | Greenbelt | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 309 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 310 | Columbia | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 312 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 10/11/1997 |
| 301 | 312 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 10/11/1997 |
| 301 | 313 | Riverdale | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 313 | College Park | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 313 | Greenbelt | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 314 | Lanham | Landline | Paetec Communications, Inc. - Md | 2/4/1994 |
| 301 | 314 | Hyattsville | Landline | Paetec Communications, Inc. - Md | 2/4/1994 |
| 301 | 315 | Rockville | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 316 | Temple Hills | Landline | Verizon Maryland, Inc. | 7/6/1997 |
| 301 | 316 | Oxon Hill | Landline | Verizon Maryland, Inc. | 7/6/1997 |
| 301 | 316 | Suitland | Landline | Verizon Maryland, Inc. | 7/6/1997 |
| 301 | 317 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 318 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 318 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 319 | Bethesda | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 319 | Rockville | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 319 | Kensington | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 320 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 320 | Glen Echo | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 321 | Rockville | Landline | Telcove Operations, Inc. - Md | 7/6/1997 |
| 301 | 322 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 322 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 323 | Laurel | Landline | Level 3 Telecom Of Maryland, Llc - Md | 7/6/1997 |
| 301 | 324 | Capitol Heights | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 324 | Hyattsville | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 324 | District Heights | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 325 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 7/4/1995 |
| 301 | 326 | Silver Spring | Wireless | Omnipoint Communications Cap Operations, Llc | 10/11/1997 |
| 301 | 327 | Upper Marlboro | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 3/9/2006 |
| 301 | 327 | Lothian | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 3/9/2006 |
| 301 | 328 | Bethesda | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 6/21/2006 |
| 301 | 328 | Chevy Chase | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 6/21/2006 |
| 301 | 329 | Riverdale | Wireless | Cavalier Telephone Mid-atlantic, Llc - Md | 9/20/2011 |
| 301 | 329 | College Park | Wireless | Cavalier Telephone Mid-atlantic, Llc - Md | 9/20/2011 |
| 301 | 329 | Greenbelt | Wireless | Cavalier Telephone Mid-atlantic, Llc - Md | 9/20/2011 |
| 301 | 330 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 330 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 331 | Hagerstown | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 332 | Silver Spring | Wireless | New Cingular Wireless Pcs, Llc - Dc | 10/15/1996 |
| 301 | 333 | Capitol Heights | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 333 | Hyattsville | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 333 | District Heights | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 334 | Oakland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 335 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 9/11/1994 |
| 301 | 335 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 9/11/1994 |
| 301 | 336 | Capitol Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 336 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 336 | District Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 337 | Gaithersburg | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 337 | Montgomery Village | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 338 | Cumberland | Landline | Idt America Corp - Md | 1/31/2006 |
| 301 | 339 | Rockville | Landline | Cavalier Telephone Mid-atlantic, Llc - Md | 10/11/1997 |
| 301 | 339 | Derwood | Landline | Cavalier Telephone Mid-atlantic, Llc - Md | 10/11/1997 |
| 301 | 340 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 341 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 341 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 342 | Patuxent River | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 343 | Capitol Heights | Wireless | Sprint Spectrum L.p. | 2/11/1995 |
| 301 | 343 | Suitland | Wireless | Sprint Spectrum L.p. | 2/11/1995 |
| 301 | 343 | District Heights | Wireless | Sprint Spectrum L.p. | 2/11/1995 |
| 301 | 344 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 344 | College Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 344 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 345 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 345 | College Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 345 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 346 | Silver Spring | Wireless | New Cingular Wireless Pcs, Llc - Dc | 10/11/1997 |
| 301 | 347 | Bethesda | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 347 | Chevy Chase | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 348 | Silver Spring | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 348 | Bethesda | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 348 | Kensington | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 349 | Poolesville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 350 | Capitol Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 350 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 350 | District Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 351 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 7/4/1995 |
| 301 | 352 | Glenn Dale | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 352 | Bowie | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 353 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 353 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 354 | Rockville | Landline | Teleport Communications America, Llc - Dc | 1/10/1996 |
| 301 | 354 | Derwood | Landline | Teleport Communications America, Llc - Dc | 1/10/1996 |
| 301 | 355 | Gaithersburg | Landline | Verizon Maryland, Inc. | 12/8/2005 |
| 301 | 355 | Montgomery Village | Landline | Verizon Maryland, Inc. | 12/8/2005 |
| 301 | 356 | Laurel | Landline | Vdl, Inc. Dba Global Telecom Brokers - Md | 8/17/2004 |
| 301 | 357 | Mount Rainier | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 10/12/2006 |
| 301 | 357 | Oxon Hill | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 10/12/2006 |
| 301 | 357 | Brentwood | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 10/12/2006 |
| 301 | 358 | Upper Marlboro | Landline | Level 3 Communications, Llc - Md | 10/11/1997 |
| 301 | 358 | Lothian | Landline | Level 3 Communications, Llc - Md | 10/11/1997 |
| 301 | 359 | Luke | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 359 | Westernport | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 360 | Frederick | Landline | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 361 | Laurel | Landline | Level 3 Telecom Of Maryland, Llc - Md | 10/11/1997 |
| 301 | 362 | Laurel | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 363 | Clarksburg | Landline | Level 3 Communications, Llc - Md | 8/16/2006 |
| 301 | 363 | Damascus | Landline | Level 3 Communications, Llc - Md | 8/16/2006 |
| 301 | 363 | Monrovia | Landline | Level 3 Communications, Llc - Md | 8/16/2006 |
| 301 | 364 | Hyattsville | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 364 | Mount Rainier | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 364 | Brentwood | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 365 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 365 | Potomac | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 365 | Cabin John | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 366 | Gaithersburg | Wireless | Sprint Spectrum L.p. | 10/11/1997 |
| 301 | 366 | Montgomery Village | Wireless | Sprint Spectrum L.p. | 10/11/1997 |
| 301 | 367 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/11/1995 |
| 301 | 368 | Damascus | Landline | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 369 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 370 | Gaithersburg | Wireless | Sprint Spectrum L.p. | 5/18/1998 |
| 301 | 370 | Montgomery Village | Wireless | Sprint Spectrum L.p. | 5/18/1998 |
| 301 | 371 | Middletown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 372 | Brandywine | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 373 | California | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 373 | Loveville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 373 | Hollywood | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 374 | Waldorf | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 375 | Accokeek | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 375 | Pomfret | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 375 | Bryans Road | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 376 | Laurel | Wireless | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 377 | Laurel | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 10/11/1997 |
| 301 | 378 | Frederick | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 2/20/2007 |
| 301 | 379 | Beltsville | Wireless | Sprint Spectrum L.p. | 1/25/1998 |
| 301 | 379 | Laurel | Wireless | Sprint Spectrum L.p. | 1/25/1998 |
| 301 | 380 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 380 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 380 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 382 | Rockville | Wireless | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 383 | Glenn Dale | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 10/11/1997 |
| 301 | 383 | Lanham | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 10/11/1997 |
| 301 | 383 | Bowie | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 10/11/1997 |
| 301 | 384 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 384 | Spencerville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 385 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 4/1/1997 |
| 301 | 385 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 4/1/1997 |
| 301 | 386 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 386 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 387 | Swanton | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 387 | Mc Henry | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 387 | Oakland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 388 | Silver Spring | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 388 | Spencerville | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 389 | Laurel | Landline | Level 3 Telecom Of Maryland, Llc - Md | 1/25/1998 |
| 301 | 390 | Glenn Dale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 390 | Bowie | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 391 | Damascus | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 392 | La Plata | Landline | Verizon Maryland, Inc. | 7/6/1997 |
| 301 | 392 | Port Tobacco | Landline | Verizon Maryland, Inc. | 7/6/1997 |
| 301 | 392 | White Plains | Landline | Verizon Maryland, Inc. | 7/6/1997 |
| 301 | 393 | Hagerstown | Landline | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 394 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 394 | Beltsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 394 | Burtonsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 395 | Laurel | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 8/17/2004 |
| 301 | 396 | Waldorf | Landline | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 397 | Riverdale | Wireless | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 397 | College Park | Wireless | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 397 | Greenbelt | Wireless | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 398 | Rockville | Landline | Verizon Maryland, Inc. | 10/9/2003 |
| 301 | 398 | Derwood | Landline | Verizon Maryland, Inc. | 10/9/2003 |
| 301 | 399 | Waldorf | Wireless | Sprint Spectrum L.p. | 1/25/1998 |
| 301 | 400 | Bethesda | Landline | Verizon Maryland, Inc. | 3/29/2010 |
| 301 | 400 | Rockville | Landline | Verizon Maryland, Inc. | 3/29/2010 |
| 301 | 400 | Kensington | Landline | Verizon Maryland, Inc. | 3/29/2010 |
| 301 | 401 | Frederick | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 402 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 402 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 403 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 403 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 403 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 404 | Beltsville | Wireless | Sprint Spectrum L.p. | 4/15/1996 |
| 301 | 404 | Laurel | Wireless | Sprint Spectrum L.p. | 4/15/1996 |
| 301 | 405 | Lanham | Landline | Paetec Communications, Inc. - Md | 2/4/1994 |
| 301 | 405 | Hyattsville | Landline | Paetec Communications, Inc. - Md | 2/4/1994 |
| 301 | 406 | Bethesda | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 406 | Chevy Chase | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 407 | Poolesville | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 408 | Silver Spring | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 408 | Takoma Park | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 408 | Hyattsville | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 409 | Riverdale | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 409 | College Park | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 409 | Greenbelt | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 412 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 412 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 413 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 414 | Damascus | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 415 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 415 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 416 | Williamsport | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 417 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 417 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 418 | Frederick | Landline | Verizon Maryland, Inc. | 11/20/2002 |
| 301 | 419 | Beltsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 419 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 420 | Capitol Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 420 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 420 | District Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 421 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 421 | Spencerville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 422 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 422 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 422 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 423 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 423 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 423 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 424 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 425 | Beltsville | Wireless | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 425 | Laurel | Wireless | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 426 | Beltsville | Wireless | Verizon Maryland, Inc. | 4/15/1996 |
| 301 | 426 | Laurel | Wireless | Verizon Maryland, Inc. | 4/15/1996 |
| 301 | 427 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 427 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 428 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 428 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 429 | Lanham | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 429 | Hyattsville | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 429 | Greenbelt | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 430 | Upper Marlboro | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 430 | Bowie | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 431 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 431 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 431 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 432 | Keedysville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 433 | Temple Hills | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 433 | Fort Washington | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 433 | Oxon Hill | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 434 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 434 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 434 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 435 | Bethesda | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 435 | Chevy Chase | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 436 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 436 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 436 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 437 | Beltsville | Wireless | Sprint Spectrum L.p. | 8/14/1998 |
| 301 | 437 | Laurel | Wireless | Sprint Spectrum L.p. | 8/14/1998 |
| 301 | 438 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 438 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 439 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 439 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 439 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 440 | Capitol Heights | Wireless | Sprint Spectrum L.p. | 5/18/1998 |
| 301 | 440 | Suitland | Wireless | Sprint Spectrum L.p. | 5/18/1998 |
| 301 | 440 | District Heights | Wireless | Sprint Spectrum L.p. | 5/18/1998 |
| 301 | 441 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 441 | College Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 441 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 442 | Beltsville | Wireless | Sprint Spectrum L.p. | 1/25/1998 |
| 301 | 442 | Laurel | Wireless | Sprint Spectrum L.p. | 1/25/1998 |
| 301 | 443 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 444 | Gaithersburg | Landline | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 444 | Montgomery Village | Landline | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 445 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 445 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 445 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 446 | Riverdale | Landline | Verizon Maryland, Inc. | 8/14/1998 |
| 301 | 446 | College Park | Landline | Verizon Maryland, Inc. | 8/14/1998 |
| 301 | 446 | Greenbelt | Landline | Verizon Maryland, Inc. | 8/14/1998 |
| 301 | 447 | Emmitsburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 448 | Silver Spring | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 8/20/2000 |
| 301 | 449 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 449 | Fort Washington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 449 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 451 | Bethesda | Landline | Verizon Maryland, Inc. | 5/10/1999 |
| 301 | 451 | Chevy Chase | Landline | Verizon Maryland, Inc. | 5/10/1999 |
| 301 | 452 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/11/1995 |
| 301 | 453 | Kitzmiller | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 454 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 454 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 454 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 455 | Beltsville | Wireless | Sprint Spectrum L.p. | 1/25/1998 |
| 301 | 455 | Laurel | Wireless | Sprint Spectrum L.p. | 1/25/1998 |
| 301 | 456 | Hyattsville | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 4/1/1997 |
| 301 | 456 | Mount Rainier | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 4/1/1997 |
| 301 | 456 | Brentwood | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 4/1/1997 |
| 301 | 457 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 457 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 458 | Hyattsville | Landline | Teleport Communications America, Llc - Dc | 7/4/1995 |
| 301 | 458 | Mount Rainier | Landline | Teleport Communications America, Llc - Dc | 7/4/1995 |
| 301 | 458 | Brentwood | Landline | Teleport Communications America, Llc - Dc | 7/4/1995 |
| 301 | 459 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 459 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 459 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 460 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 460 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 461 | Rockville | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 5/18/1998 |
| 301 | 462 | Myersville | Wireless | Sprint Spectrum L.p. - Md | 10/11/1997 |
| 301 | 463 | Lonaconing | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 464 | Glenn Dale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 464 | Bowie | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 465 | Myersville | Wireless | Sprint Spectrum L.p. - Md | 1/11/1997 |
| 301 | 466 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 7/4/1995 |
| 301 | 467 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 1/10/1996 |
| 301 | 468 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 469 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 469 | Potomac | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 469 | Cabin John | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 470 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 471 | Frederick | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 4/15/1996 |
| 301 | 472 | Mechanicsville | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 473 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 474 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 474 | College Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 474 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 475 | Leonardtown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 476 | Silver Spring | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 476 | Spencerville | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 477 | Riverdale | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 10/11/1997 |
| 301 | 477 | College Park | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 10/11/1997 |
| 301 | 477 | Greenbelt | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 10/11/1997 |
| 301 | 478 | Oldtown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 479 | Riverdale | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 479 | College Park | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 479 | Greenbelt | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 480 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 480 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 481 | Leonardtown | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 4/15/1996 |
| 301 | 482 | Damascus | Landline | Verizon Maryland, Inc. | 4/15/1996 |
| 301 | 483 | Laurel | Landline | Verizon Maryland, Inc. | 4/15/1996 |
| 301 | 484 | Hyattsville | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 4/1/1997 |
| 301 | 484 | Mount Rainier | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 4/1/1997 |
| 301 | 484 | Brentwood | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 4/1/1997 |
| 301 | 485 | Temple Hills | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 4/1/1997 |
| 301 | 485 | Fort Washington | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 4/1/1997 |
| 301 | 485 | Oxon Hill | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 4/1/1997 |
| 301 | 486 | Riverdale | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 486 | College Park | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 486 | Greenbelt | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 487 | Myersville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 488 | Riverdale | Wireless | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 488 | College Park | Wireless | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 488 | Greenbelt | Wireless | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 489 | Riverdale | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 489 | College Park | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 489 | Greenbelt | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 490 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 491 | Hagerstown | Wireless | Uscoc Of Cumberland, Inc. Dba United States Cel Md | 2/4/1994 |
| 301 | 492 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 492 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 493 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 493 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 493 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 494 | Upper Marlboro | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 494 | Lothian | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 495 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 495 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 496 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 496 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 497 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 498 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 499 | Capitol Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 499 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 499 | District Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 500 | Bethesda | Landline | Xo Maryland, Llc | 9/1/2010 |
| 301 | 500 | Chevy Chase | Landline | Xo Maryland, Llc | 9/1/2010 |
| 301 | 501 | Oakland | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 502 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 503 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 503 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 504 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 504 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 505 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 505 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 505 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 506 | Riverdale | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 506 | College Park | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 506 | Greenbelt | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 507 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 507 | College Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 507 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 508 | Myersville | Wireless | New Cingular Wireless Pcs, Llc - Dc | 5/18/1998 |
| 301 | 509 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 510 | Riverdale | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 510 | College Park | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 510 | Greenbelt | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 512 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 1/10/1996 |
| 301 | 513 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 513 | College Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 513 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 514 | Frederick | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 7/1/1996 |
| 301 | 515 | Gaithersburg | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 515 | Montgomery Village | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 516 | Capitol Heights | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 516 | Suitland | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 516 | District Heights | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 517 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 518 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 519 | Gaithersburg | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 519 | Montgomery Village | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 520 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 521 | Temple Hills | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 521 | Fort Washington | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 521 | Oxon Hill | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 522 | Rockville | Wireless | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 523 | Beltsville | Wireless | Sprint Spectrum L.p. | 10/15/1996 |
| 301 | 523 | Laurel | Wireless | Sprint Spectrum L.p. | 10/15/1996 |
| 301 | 524 | Frederick | Wireless | Sprint Spectrum L.p. | 8/14/1998 |
| 301 | 525 | Gaithersburg | Landline | Quantum Telecommunications, Inc. - Md | 10/16/2003 |
| 301 | 525 | Montgomery Village | Landline | Quantum Telecommunications, Inc. - Md | 10/16/2003 |
| 301 | 526 | Silver Spring | Wireless | New Cingular Wireless Pcs, Llc - Dc | 8/14/1998 |
| 301 | 527 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 527 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 528 | Gaithersburg | Landline | Verizon Maryland, Inc. | 8/14/1998 |
| 301 | 528 | Montgomery Village | Landline | Verizon Maryland, Inc. | 8/14/1998 |
| 301 | 529 | Rockville | Wireless | New Cingular Wireless Pcs, Llc - Dc | 8/14/1998 |
| 301 | 530 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 530 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 530 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 531 | Hyattsville | Landline | Starpower Communications, Llc - Md | 11/20/1998 |
| 301 | 531 | Mount Rainier | Landline | Starpower Communications, Llc - Md | 11/20/1998 |
| 301 | 531 | Brentwood | Landline | Starpower Communications, Llc - Md | 11/20/1998 |
| 301 | 532 | Columbia | Wireless | Omnipoint Communications Cap Operations, Llc | 2/20/2015 |
| 301 | 533 | Oakland | Landline | Verizon Maryland, Inc. | 8/14/1998 |
| 301 | 534 | Indian Head | Landline | Ymax Communications Corp. - Md | 11/15/2006 |
| 301 | 535 | Waldorf | Wireless | New Cingular Wireless Pcs, Llc - Dc | 8/14/1998 |
| 301 | 536 | Leonardtown | Wireless | Sprint Spectrum L.p. | 11/20/1998 |
| 301 | 537 | Beltsville | Wireless | Sprint Spectrum L.p. | 8/14/1998 |
| 301 | 537 | Laurel | Wireless | Sprint Spectrum L.p. | 8/14/1998 |
| 301 | 538 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/11/1995 |
| 301 | 538 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/11/1995 |
| 301 | 539 | La Plata | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 539 | Bel Alton | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 539 | Port Tobacco | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 540 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 540 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 541 | Hyattsville | Landline | Teleport Communications America, Llc - Dc | 11/20/1998 |
| 301 | 541 | Mount Rainier | Landline | Teleport Communications America, Llc - Dc | 11/20/1998 |
| 301 | 541 | Brentwood | Landline | Teleport Communications America, Llc - Dc | 11/20/1998 |
| 301 | 542 | Waldorf | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 543 | Laurel | Landline | Teleport Communications America, Llc - Dc | 10/11/1997 |
| 301 | 544 | Rockville | Wireless | Verizon Maryland, Inc. | 11/20/1998 |
| 301 | 545 | Rockville | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 546 | Hyattsville | Landline | Verizon Maryland, Inc. | 4/7/2014 |
| 301 | 547 | Hyattsville | Landline | Teleport Communications America, Llc - Dc | 1/10/1996 |
| 301 | 547 | Mount Rainier | Landline | Teleport Communications America, Llc - Dc | 1/10/1996 |
| 301 | 547 | Brentwood | Landline | Teleport Communications America, Llc - Dc | 1/10/1996 |
| 301 | 548 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 548 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 549 | Laurel | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 551 | Silver Spring | Landline | Baltimore-washington Telephone (bwt) | 6/13/2000 |
| 301 | 551 | Bethesda | Landline | Baltimore-washington Telephone (bwt) | 6/13/2000 |
| 301 | 551 | Kensington | Landline | Baltimore-washington Telephone (bwt) | 6/13/2000 |
| 301 | 552 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 552 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 552 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 553 | Waldorf | Wireless | Usa Mobility Wireless, Inc. | 5/18/1998 |
| 301 | 554 | Bethesda | Wireless | Usa Mobility Wireless, Inc. | 5/18/1998 |
| 301 | 554 | Chevy Chase | Wireless | Usa Mobility Wireless, Inc. | 5/18/1998 |
| 301 | 556 | Gaithersburg | Landline | Teleport Communications America, Llc - Dc | 10/11/1997 |
| 301 | 556 | Montgomery Village | Landline | Teleport Communications America, Llc - Dc | 10/11/1997 |
| 301 | 557 | Hyattsville | Landline | Broadwing Communications. Llc - Md | 9/6/2011 |
| 301 | 557 | Mount Rainier | Landline | Broadwing Communications. Llc - Md | 9/6/2011 |
| 301 | 557 | Brentwood | Landline | Broadwing Communications. Llc - Md | 9/6/2011 |
| 301 | 558 | Riverdale | Wireless | Usa Mobility Wireless, Inc. | 5/18/1998 |
| 301 | 558 | College Park | Wireless | Usa Mobility Wireless, Inc. | 5/18/1998 |
| 301 | 558 | Greenbelt | Wireless | Usa Mobility Wireless, Inc. | 5/18/1998 |
| 301 | 559 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 559 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 560 | Hyattsville | Landline | Paetec Communications, Inc. - Md | 8/14/1998 |
| 301 | 560 | Mount Rainier | Landline | Paetec Communications, Inc. - Md | 8/14/1998 |
| 301 | 560 | Brentwood | Landline | Paetec Communications, Inc. - Md | 8/14/1998 |
| 301 | 561 | Silver Spring | Landline | Baltimore-washington Telephone (bwt) | 3/3/2001 |
| 301 | 562 | Silver Spring | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 562 | Takoma Park | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 563 | Silver Spring | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 563 | Takoma Park | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 564 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 564 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 564 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 565 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 565 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 566 | Beltsville | Wireless | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 566 | Laurel | Wireless | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 567 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 567 | Fort Washington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 567 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 568 | Capitol Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 568 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 568 | District Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 569 | Gaithersburg | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 8/14/1998 |
| 301 | 569 | Montgomery Village | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 8/14/1998 |
| 301 | 570 | Ashton | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 571 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 571 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 571 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 572 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 572 | Beltsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 572 | Burtonsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 573 | Hagerstown | Wireless | Sprint Spectrum L.p. - Md | 11/20/1998 |
| 301 | 574 | Upper Marlboro | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 574 | Lothian | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 575 | Laurel | Landline | Us Lec Of Maryland, Inc. | 8/14/1998 |
| 301 | 576 | Silver Spring | Landline | Paetec Communications, Inc. - Md | 8/14/1998 |
| 301 | 577 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 577 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 577 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 578 | Silver Spring | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 578 | Takoma Park | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 579 | Brandywine | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 580 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 581 | Bethesda | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 581 | Rockville | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 581 | Kensington | Landline | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 582 | Hagerstown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 583 | Lanham | Landline | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 583 | Hyattsville | Landline | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 584 | Silver Spring | Landline | Baltimore-washington Telephone (bwt) | 6/13/2000 |
| 301 | 584 | Rockville | Landline | Baltimore-washington Telephone (bwt) | 6/13/2000 |
| 301 | 585 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 585 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 586 | Silver Spring | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 586 | Beltsville | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 586 | Burtonsville | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 587 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 587 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 588 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 588 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 589 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 589 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 590 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 590 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 591 | Gaithersburg | Landline | Paetec Communications, Inc. - Md | 8/14/1998 |
| 301 | 591 | Montgomery Village | Landline | Paetec Communications, Inc. - Md | 8/14/1998 |
| 301 | 592 | Silver Spring | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 593 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 594 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 594 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 595 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 595 | Beltsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 595 | Burtonsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 596 | Columbia | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 597 | Hancock | Landline | New Frontiers Telecommunications, Inc. | 6/13/2000 |
| 301 | 598 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 598 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 599 | Clinton | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 599 | Cheltenham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 599 | Andrews Air Force Base | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 600 | Frederick | Landline | Verizon Maryland, Inc. | 7/6/2006 |
| 301 | 601 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 601 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 602 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 4/15/1996 |
| 301 | 603 | Silver Spring | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 603 | Rockville | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 604 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 605 | Rockville | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 605 | Derwood | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 606 | Frederick | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 607 | New Market | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 608 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 608 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 609 | La Plata | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 609 | Port Tobacco | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 609 | White Plains | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 610 | Rockville | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 612 | Sandy Spring | Wireless | Teleport Communications America, Llc - Md | 10/11/2012 |
| 301 | 612 | Ashton | Wireless | Teleport Communications America, Llc - Md | 10/11/2012 |
| 301 | 612 | Brinklow | Wireless | Teleport Communications America, Llc - Md | 10/11/2012 |
| 301 | 613 | Beltsville | Wireless | Sprint Spectrum L.p. | 7/1/1996 |
| 301 | 613 | Laurel | Wireless | Sprint Spectrum L.p. | 7/1/1996 |
| 301 | 614 | Riverdale | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 614 | College Park | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 614 | Greenbelt | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 615 | Riverdale | Wireless | Bandwidth.com Clec, Llc - Md | 2/4/1994 |
| 301 | 615 | College Park | Wireless | Bandwidth.com Clec, Llc - Md | 2/4/1994 |
| 301 | 615 | Greenbelt | Wireless | Bandwidth.com Clec, Llc - Md | 2/4/1994 |
| 301 | 616 | Oakland | Wireless | Uscoc Of Cumberland, Inc. Dba United States Cel Md | 2/4/1994 |
| 301 | 617 | Laurel | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 618 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 618 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 619 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 620 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 621 | Glenn Dale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 621 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 621 | Bowie | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 622 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 622 | Spencerville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 623 | Hyattsville | Landline | Teleport Communications America, Llc - Dc | 10/11/1997 |
| 301 | 623 | Mount Rainier | Landline | Teleport Communications America, Llc - Dc | 10/11/1997 |
| 301 | 623 | Brentwood | Landline | Teleport Communications America, Llc - Dc | 10/11/1997 |
| 301 | 624 | Frederick | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 625 | Silver Spring | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 625 | Spencerville | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 626 | Silver Spring | Wireless | Verizon Maryland, Inc. | 5/18/1998 |
| 301 | 626 | Takoma Park | Wireless | Verizon Maryland, Inc. | 5/18/1998 |
| 301 | 627 | Upper Marlboro | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 627 | Lothian | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 628 | Hyattsville | Landline | Teleport Communications America, Llc - Dc | 1/10/1996 |
| 301 | 628 | Mount Rainier | Landline | Teleport Communications America, Llc - Dc | 1/10/1996 |
| 301 | 628 | Brentwood | Landline | Teleport Communications America, Llc - Dc | 1/10/1996 |
| 301 | 629 | Glenn Dale | Wireless | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 629 | Lanham | Wireless | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 629 | Bowie | Wireless | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 630 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 630 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 630 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 631 | Frederick | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 632 | Waldorf | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 633 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/11/1995 |
| 301 | 633 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/11/1995 |
| 301 | 634 | Hyattsville | Landline | Teleport Communications America, Llc - Dc | 10/11/1997 |
| 301 | 634 | Mount Rainier | Landline | Teleport Communications America, Llc - Dc | 10/11/1997 |
| 301 | 634 | Brentwood | Landline | Teleport Communications America, Llc - Dc | 10/11/1997 |
| 301 | 635 | Myersville | Landline | New Frontiers Telecommunications, Inc. | 6/13/2000 |
| 301 | 636 | Lanham | Landline | Verizon Maryland, Inc. | 6/13/2000 |
| 301 | 636 | Hyattsville | Landline | Verizon Maryland, Inc. | 6/13/2000 |
| 301 | 637 | Rockville | Landline | Level 3 Communications, Llc - Md | 8/14/1998 |
| 301 | 637 | Derwood | Landline | Level 3 Communications, Llc - Md | 8/14/1998 |
| 301 | 638 | Waldorf | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 639 | Frederick | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/11/1995 |
| 301 | 640 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 640 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 641 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 9/11/1994 |
| 301 | 642 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 1/25/1998 |
| 301 | 642 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 1/25/1998 |
| 301 | 643 | Waldorf | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 9/11/1994 |
| 301 | 644 | Frederick | Landline | Verizon Maryland, Inc. | 8/14/1998 |
| 301 | 645 | Waldorf | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 646 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 1/10/1996 |
| 301 | 646 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 1/10/1996 |
| 301 | 647 | Laurel | Wireless | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 648 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 648 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 649 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 650 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 650 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 651 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/11/1995 |
| 301 | 652 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 652 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 653 | Waldorf | Wireless | New Cingular Wireless Pcs, Llc - Dc | 1/10/1996 |
| 301 | 654 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 654 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 655 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 4/15/1996 |
| 301 | 655 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 4/15/1996 |
| 301 | 656 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 656 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 657 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 657 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 658 | Sandy Spring | Landline | Teleport Communications America, Llc - Dc | 10/11/1997 |
| 301 | 658 | Ashton | Landline | Teleport Communications America, Llc - Dc | 10/11/1997 |
| 301 | 658 | Brinklow | Landline | Teleport Communications America, Llc - Dc | 10/11/1997 |
| 301 | 659 | Waldorf | Wireless | New Cingular Wireless Pcs, Llc - Dc | 5/18/1998 |
| 301 | 660 | Keedysville | Wireless | New Cingular Wireless Pcs, Llc - Dc | 3/19/2004 |
| 301 | 661 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 9/11/1994 |
| 301 | 661 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 9/11/1994 |
| 301 | 662 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 663 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 664 | Bethesda | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 664 | Chevy Chase | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 665 | Hagerstown | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 666 | Glenn Dale | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 666 | Lanham | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 666 | Bowie | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 667 | Myersville | Wireless | New Cingular Wireless Pcs, Llc - Dc | 9/11/1994 |
| 301 | 668 | Frederick | Landline | Verizon Maryland, Inc. | 8/14/1998 |
| 301 | 669 | Capitol Heights | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 669 | Suitland | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 669 | District Heights | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 670 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 670 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 671 | Hagerstown | Landline | New Frontiers Telecommunications, Inc. | 6/13/2000 |
| 301 | 672 | Callaway | Wireless | Sprint Spectrum L.p. | 11/20/1998 |
| 301 | 672 | Great Mills | Wireless | Sprint Spectrum L.p. | 11/20/1998 |
| 301 | 672 | Tall Timbers | Wireless | Sprint Spectrum L.p. | 11/20/1998 |
| 301 | 673 | Frederick | Landline | New Frontiers Telecommunications, Inc. | 6/13/2000 |
| 301 | 674 | Bethesda | Wireless | Sprint Spectrum L.p. | 11/20/1998 |
| 301 | 674 | Chevy Chase | Wireless | Sprint Spectrum L.p. | 11/20/1998 |
| 301 | 675 | Silver Spring | Wireless | Omnipoint Communications Cap Operations, Llc | 6/13/2000 |
| 301 | 676 | Frederick | Wireless | New Cingular Wireless Pcs, Llc - Dc | 7/6/1997 |
| 301 | 677 | Glenn Dale | Landline | Teleport Communications America, Llc - Dc | 2/4/1994 |
| 301 | 677 | Lanham | Landline | Teleport Communications America, Llc - Dc | 2/4/1994 |
| 301 | 677 | Bowie | Landline | Teleport Communications America, Llc - Dc | 2/4/1994 |
| 301 | 678 | Hancock | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 679 | Hyattsville | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 679 | Mount Rainier | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 679 | Brentwood | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 680 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 680 | Spencerville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 681 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 682 | Frederick | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 683 | Hyattsville | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 683 | Mount Rainier | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 683 | Brentwood | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 684 | Indian Head | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 685 | Clarksburg | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 685 | Damascus | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 685 | Monrovia | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 686 | Temple Hills | Landline | Verizon Maryland, Inc. | 5/10/1999 |
| 301 | 686 | Fort Washington | Landline | Verizon Maryland, Inc. | 5/10/1999 |
| 301 | 686 | Oxon Hill | Landline | Verizon Maryland, Inc. | 5/10/1999 |
| 301 | 687 | Frostburg | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 688 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 689 | Frostburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 690 | Leonardtown | Landline | Idt America Corp - Md | 5/23/2007 |
| 301 | 691 | Poolesville | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 692 | Hyattsville | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 692 | Mount Rainier | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 692 | Brentwood | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 693 | Frederick | Wireless | Omnipoint Communications Cap Operations, Llc | 6/13/2000 |
| 301 | 694 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 695 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 696 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 697 | Cumberland | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 698 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 699 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 699 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 699 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 701 | Silver Spring | Wireless | Bandwidth.com Clec, Llc - Md | 2/4/1994 |
| 301 | 701 | Takoma Park | Wireless | Bandwidth.com Clec, Llc - Md | 2/4/1994 |
| 301 | 701 | Hyattsville | Wireless | Bandwidth.com Clec, Llc - Md | 2/4/1994 |
| 301 | 702 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 702 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 702 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 703 | Mount Airy | Landline | Level 3 Communications, Llc - Md | 8/29/2002 |
| 301 | 704 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 705 | Waldorf | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 706 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 4/15/1996 |
| 301 | 707 | Cumberland | Wireless | Uscoc Of Cumberland, Inc. Dba United States Cel Md | 2/4/1994 |
| 301 | 708 | Riverdale | Wireless | Cavalier Telephone Mid-atlantic, Llc - Md | 9/20/2011 |
| 301 | 708 | College Park | Wireless | Cavalier Telephone Mid-atlantic, Llc - Md | 9/20/2011 |
| 301 | 708 | Greenbelt | Wireless | Cavalier Telephone Mid-atlantic, Llc - Md | 9/20/2011 |
| 301 | 709 | Riverdale | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 709 | College Park | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 709 | Greenbelt | Wireless | Usa Mobility Wireless, Inc. | 2/4/1994 |
| 301 | 710 | Waldorf | Landline | Level 3 Communications, Llc - Md | 12/30/2005 |
| 301 | 712 | Frederick | Landline | Mci Worldcom Communications, Inc. - Md | 3/27/2005 |
| 301 | 713 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 713 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 714 | Hagerstown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 715 | Upper Marlboro | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 715 | Lothian | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 716 | Beltsville | Wireless | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 716 | Laurel | Wireless | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 717 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 718 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 718 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 719 | Hyattsville | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 719 | Mount Rainier | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 719 | Brentwood | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 720 | Brandywine | Landline | Teleport Communications America, Llc - Dc | 8/14/1998 |
| 301 | 721 | Gaithersburg | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 721 | Montgomery Village | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 722 | Cumberland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 723 | Cumberland | Landline | Verizon Maryland, Inc. | 5/18/1998 |
| 301 | 724 | Cumberland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 725 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 727 | Capitol Heights | Landline | Baltimore-washington Telephone (bwt) | 6/13/2000 |
| 301 | 727 | Hyattsville | Landline | Baltimore-washington Telephone (bwt) | 6/13/2000 |
| 301 | 727 | District Heights | Landline | Baltimore-washington Telephone (bwt) | 6/13/2000 |
| 301 | 728 | Silver Spring | Wireless | Omnipoint Communications Cap Operations, Llc | 6/13/2000 |
| 301 | 729 | Cumberland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 730 | Myersville | Wireless | New Cingular Wireless Pcs, Llc - Dc | 11/20/1998 |
| 301 | 731 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 731 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 731 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 732 | Riverdale | Wireless | Metro Pcs, Inc. | 1/10/1996 |
| 301 | 732 | College Park | Wireless | Metro Pcs, Inc. | 1/10/1996 |
| 301 | 732 | Greenbelt | Wireless | Metro Pcs, Inc. | 1/10/1996 |
| 301 | 733 | Hagerstown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 734 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 734 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 735 | Capitol Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 735 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 735 | District Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 736 | Capitol Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 736 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 736 | District Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 737 | Patuxent River | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 737 | Lexington Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 737 | Great Mills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 738 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 739 | Hagerstown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 740 | Gaithersburg | Landline | Verizon Maryland, Inc. | 4/22/2004 |
| 301 | 740 | Montgomery Village | Landline | Verizon Maryland, Inc. | 4/22/2004 |
| 301 | 741 | Laurel | Landline | Level 3 Communications, Llc - Md | 8/14/1998 |
| 301 | 742 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 742 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 743 | Indian Head | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 744 | Indian Head | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 745 | Hagerstown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 746 | Accident | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 747 | Hyattsville | Landline | Teleport Communications America, Llc - Dc | 11/20/1998 |
| 301 | 747 | Mount Rainier | Landline | Teleport Communications America, Llc - Dc | 11/20/1998 |
| 301 | 747 | Brentwood | Landline | Teleport Communications America, Llc - Dc | 11/20/1998 |
| 301 | 748 | Frederick | Wireless | Sprint Spectrum L.p. | 4/1/1997 |
| 301 | 749 | Temple Hills | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 749 | Fort Washington | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 749 | Oxon Hill | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 750 | Accident | Landline | Core Communications, Inc. - Md | 3/18/2004 |
| 301 | 750 | Mc Henry | Landline | Core Communications, Inc. - Md | 3/18/2004 |
| 301 | 750 | Friendsville | Landline | Core Communications, Inc. - Md | 3/18/2004 |
| 301 | 751 | Waldorf | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 1/10/1996 |
| 301 | 752 | Waldorf | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 8/14/1998 |
| 301 | 753 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 753 | Fort Washington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 753 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 754 | Silver Spring | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 755 | Silver Spring | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 756 | Laurel | Landline | Level 3 Telecom Of Maryland, Llc - Md | 1/25/1998 |
| 301 | 757 | Patuxent River | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 758 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 9/11/1994 |
| 301 | 759 | Cumberland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 760 | Bethesda | Landline | Level 3 Communications, Llc - Md | 2/27/2002 |
| 301 | 760 | Chevy Chase | Landline | Level 3 Communications, Llc - Md | 2/27/2002 |
| 301 | 761 | Silver Spring | Landline | Level 3 Communications, Llc - Md | 2/27/2002 |
| 301 | 761 | Bethesda | Landline | Level 3 Communications, Llc - Md | 2/27/2002 |
| 301 | 761 | Kensington | Landline | Level 3 Communications, Llc - Md | 2/27/2002 |
| 301 | 762 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 763 | Capitol Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 763 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 763 | District Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 764 | Waldorf | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 765 | Bethesda | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 765 | Potomac | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 765 | Cabin John | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 766 | Hagerstown | Landline | Verizon Maryland, Inc. | 4/15/1996 |
| 301 | 767 | Bethesda | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 767 | Potomac | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 767 | Cabin John | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 768 | Bethesda | Landline | Level 3 Communications, Llc - Md | 2/27/2002 |
| 301 | 768 | Glen Echo | Landline | Level 3 Communications, Llc - Md | 2/27/2002 |
| 301 | 768 | Cabin John | Landline | Level 3 Communications, Llc - Md | 2/27/2002 |
| 301 | 769 | Abell | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 769 | Bushwood | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 769 | Avenue | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 770 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 771 | Bethesda | Wireless | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 771 | Chevy Chase | Wireless | Verizon Maryland, Inc. | 4/1/1997 |
| 301 | 772 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 772 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 773 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 773 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 774 | Ashton | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 775 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 1/10/1996 |
| 301 | 776 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 777 | Cumberland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 778 | Capitol Heights | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 778 | Hyattsville | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 778 | District Heights | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 779 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 779 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 779 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 780 | Upper Marlboro | Landline | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 780 | Lothian | Landline | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 781 | Frostburg | Landline | New Frontiers Telecommunications, Inc. | 6/13/2000 |
| 301 | 782 | Brandywine | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 783 | Cumberland | Landline | New Frontiers Telecommunications, Inc. | 6/13/2000 |
| 301 | 784 | Cumberland | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 785 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 8/14/1998 |
| 301 | 786 | Westernport | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 787 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 8/14/1998 |
| 301 | 788 | Frederick | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 8/14/1998 |
| 301 | 789 | Hyattsville | Landline | Core Communications, Inc. - Pa | 8/13/2002 |
| 301 | 789 | Mount Rainier | Landline | Core Communications, Inc. - Pa | 8/13/2002 |
| 301 | 789 | Brentwood | Landline | Core Communications, Inc. - Pa | 8/13/2002 |
| 301 | 790 | Hagerstown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 791 | Hagerstown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 792 | Silver Spring | Wireless | Omnipoint Communications Cap Operations, Llc | 6/13/2000 |
| 301 | 793 | Silver Spring | Wireless | Omnipoint Communications Cap Operations, Llc | 6/13/2000 |
| 301 | 794 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 794 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 794 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 795 | Takoma Park | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 795 | Hyattsville | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 795 | Mount Rainier | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 796 | Riverdale | Landline | Verizon Maryland, Inc. | 6/30/2003 |
| 301 | 796 | College Park | Landline | Verizon Maryland, Inc. | 6/30/2003 |
| 301 | 796 | Greenbelt | Landline | Verizon Maryland, Inc. | 6/30/2003 |
| 301 | 797 | Hagerstown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 798 | New Market | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 799 | Keedysville | Landline | Core Communications, Inc. - Md | 3/18/2004 |
| 301 | 800 | Hagerstown | Wireless | Virginia Pcs Alliance, L.c. | 4/29/2010 |
| 301 | 801 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 4/15/1996 |
| 301 | 802 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 10/15/1996 |
| 301 | 803 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 803 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 803 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 804 | Sandy Spring | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 804 | Ashton | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 804 | Brinklow | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 805 | Glenn Dale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 805 | Bowie | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 806 | Beltsville | Wireless | Sprint Spectrum L.p. | 7/1/1996 |
| 301 | 806 | Laurel | Wireless | Sprint Spectrum L.p. | 7/1/1996 |
| 301 | 807 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 808 | Capitol Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 808 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 808 | District Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 809 | Glenn Dale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 809 | Bowie | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 810 | Monrovia | Landline | At&t Local | 8/14/1998 |
| 301 | 812 | North Beach | Landline | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 813 | Bethesda | Landline | Baltimore-washington Telephone (bwt) | 6/30/2001 |
| 301 | 813 | Chevy Chase | Landline | Baltimore-washington Telephone (bwt) | 6/30/2001 |
| 301 | 814 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 814 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 815 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 816 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 817 | Capitol Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 817 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 817 | District Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 818 | Waldorf | Landline | Bandwidth.com Clec, Llc - Md | 2/4/1994 |
| 301 | 819 | Silver Spring | Wireless | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 819 | Takoma Park | Wireless | Verizon Maryland, Inc. | 7/1/1996 |
| 301 | 820 | Gaithersburg | Landline | At&t Local | 11/20/1998 |
| 301 | 820 | Montgomery Village | Landline | At&t Local | 11/20/1998 |
| 301 | 821 | Laurel | Landline | At&t Local | 8/14/1998 |
| 301 | 822 | Silver Spring | Landline | At&t Local | 8/14/1998 |
| 301 | 822 | Bethesda | Landline | At&t Local | 8/14/1998 |
| 301 | 822 | Kensington | Landline | At&t Local | 8/14/1998 |
| 301 | 823 | Mount Rainier | Landline | At&t Local | 8/14/1998 |
| 301 | 823 | Oxon Hill | Landline | At&t Local | 8/14/1998 |
| 301 | 823 | Brentwood | Landline | At&t Local | 8/14/1998 |
| 301 | 824 | Smithsburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 825 | Rockville | Landline | At&t Local | 8/14/1998 |
| 301 | 825 | Derwood | Landline | At&t Local | 8/14/1998 |
| 301 | 826 | Patuxent River | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 826 | Lexington Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 826 | Great Mills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 827 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 827 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 828 | Bethesda | Landline | At&t Local | 8/14/1998 |
| 301 | 828 | Chevy Chase | Landline | At&t Local | 8/14/1998 |
| 301 | 829 | Mount Airy | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 830 | Silver Spring | Landline | At&t Local | 8/14/1998 |
| 301 | 831 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 831 | Adamstown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 832 | Bethesda | Landline | At&t Local | 8/14/1998 |
| 301 | 832 | Chevy Chase | Landline | At&t Local | 8/14/1998 |
| 301 | 832 | Mount Rainier | Landline | At&t Local | 8/14/1998 |
| 301 | 833 | Glenn Dale | Landline | Teleport Communications America, Llc - Dc | 11/11/2003 |
| 301 | 833 | Lanham | Landline | Teleport Communications America, Llc - Dc | 11/11/2003 |
| 301 | 833 | Bowie | Landline | Teleport Communications America, Llc - Dc | 11/11/2003 |
| 301 | 834 | Brunswick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 836 | Temple Hills | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 836 | Oxon Hill | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 836 | Suitland | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 837 | Takoma Park | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 837 | Hyattsville | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 837 | Mount Rainier | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 838 | Rockville | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 839 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 839 | Fort Washington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 839 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 840 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 840 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 841 | Takoma Park | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 841 | Hyattsville | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 841 | Mount Rainier | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 842 | Clear Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 843 | Waldorf | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 844 | Bethesda | Wireless | Sprint Spectrum L.p. | 10/4/2011 |
| 301 | 844 | Glen Echo | Wireless | Sprint Spectrum L.p. | 10/4/2011 |
| 301 | 844 | Cabin John | Wireless | Sprint Spectrum L.p. | 10/4/2011 |
| 301 | 845 | Walkersville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 846 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 847 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 847 | Beltsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 847 | Burtonsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 848 | Waldorf | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 8/14/1998 |
| 301 | 849 | Oakland | Landline | New Frontiers Telecommunications, Inc. | 6/13/2000 |
| 301 | 850 | Glenn Dale | Landline | Level 3 Communications, Llc - Md | 8/4/2002 |
| 301 | 850 | Lanham | Landline | Level 3 Communications, Llc - Md | 8/4/2002 |
| 301 | 850 | Bowie | Landline | Level 3 Communications, Llc - Md | 8/4/2002 |
| 301 | 851 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 851 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 851 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 852 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 852 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 852 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 853 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 853 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 854 | Columbia | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 855 | Upper Marlboro | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 855 | Lothian | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 856 | Clinton | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 856 | Cheltenham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 856 | Andrews Air Force Base | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 857 | Clear Spring | Landline | Core Communications, Inc. - Md | 7/12/2002 |
| 301 | 858 | Glenn Dale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 858 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 858 | Bowie | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 859 | Temple Hills | Landline | Level 3 Communications, Llc - Md | 1/9/2002 |
| 301 | 859 | Fort Washington | Landline | Level 3 Communications, Llc - Md | 1/9/2002 |
| 301 | 859 | Oxon Hill | Landline | Level 3 Communications, Llc - Md | 1/9/2002 |
| 301 | 860 | Glenn Dale | Landline | Verizon Maryland, Inc. | 8/20/2000 |
| 301 | 860 | Bowie | Landline | Verizon Maryland, Inc. | 8/20/2000 |
| 301 | 861 | Waldorf | Landline | Level 3 Communications, Llc - Md | 8/14/1998 |
| 301 | 862 | Patuxent River | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 862 | Lexington Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 862 | Great Mills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 863 | Patuxent River | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 863 | Lexington Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 863 | Great Mills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 864 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 864 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 864 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 865 | New Market | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 866 | Patuxent River | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 866 | Lexington Park | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 866 | Great Mills | Landline | Verizon Maryland, Inc. | 10/15/1996 |
| 301 | 867 | Takoma Park | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 867 | Hyattsville | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 867 | Mount Rainier | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 868 | Clinton | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 868 | Cheltenham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 868 | Andrews Air Force Base | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 869 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 869 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 870 | Waldorf | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 871 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 871 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 872 | Ridge | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 873 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 874 | Frederick | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 874 | Adamstown | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 875 | Laurel | Landline | Cellco Partnership Dba Verizon Wireless - Md | 3/27/2005 |
| 301 | 876 | Cumberland | Landline | Level 3 Communications, Llc - Md | 5/2/2002 |
| 301 | 877 | Clinton | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 877 | Cheltenham | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 877 | Andrews Air Force Base | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 878 | Baltimore | Landline | Mci Worldcom Communications, Inc. - Md | 1/10/1996 |
| 301 | 879 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 879 | Spencerville | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 880 | Callaway | Landline | Level 3 Communications, Llc - Md | 8/14/1998 |
| 301 | 880 | Great Mills | Landline | Level 3 Communications, Llc - Md | 8/14/1998 |
| 301 | 880 | Tall Timbers | Landline | Level 3 Communications, Llc - Md | 8/14/1998 |
| 301 | 881 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 882 | New Market | Landline | Core Communications, Inc. - Md | 3/18/2004 |
| 301 | 883 | Lanham | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 883 | Hyattsville | Landline | Verizon Maryland, Inc. | 9/11/1994 |
| 301 | 884 | Mechanicsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 885 | Waldorf | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 886 | Laurel | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 887 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 887 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 887 | Riverdale | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 888 | Brandywine | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 889 | Glenn Dale | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 889 | Lanham | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 889 | Bowie | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 890 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 890 | Beltsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 890 | Burtonsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 891 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 891 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 892 | Hyattsville | Landline | Verizon Maryland, Inc. | 3/11/2005 |
| 301 | 892 | Mount Rainier | Landline | Verizon Maryland, Inc. | 3/11/2005 |
| 301 | 892 | Brentwood | Landline | Verizon Maryland, Inc. | 3/11/2005 |
| 301 | 893 | Waldorf | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 894 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 894 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 894 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 895 | Grantsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 896 | Bethesda | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 896 | Rockville | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 896 | Kensington | Landline | Verizon Maryland, Inc. | 1/10/1996 |
| 301 | 897 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 897 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 897 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 898 | Walkersville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 899 | Temple Hills | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 899 | Oxon Hill | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 899 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 900 | Bethesda | Landline | Neutral Tandem-maryland, Llc - Md | 2/18/2015 |
| 301 | 900 | Glen Echo | Landline | Neutral Tandem-maryland, Llc - Md | 2/18/2015 |
| 301 | 900 | Cabin John | Landline | Neutral Tandem-maryland, Llc - Md | 2/18/2015 |
| 301 | 901 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 901 | College Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 901 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 902 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 902 | Beltsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 902 | Burtonsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 903 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 903 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 904 | Leonardtown | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 905 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 906 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 10/15/1996 |
| 301 | 906 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 10/15/1996 |
| 301 | 907 | Bethesda | Landline | Verizon Maryland, Inc. | 5/18/1998 |
| 301 | 907 | Chevy Chase | Landline | Verizon Maryland, Inc. | 5/18/1998 |
| 301 | 908 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 909 | Takoma Park | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 909 | Hyattsville | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 909 | Mount Rainier | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 910 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 910 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 912 | Odenton | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 913 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 913 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 914 | Swanton | Landline | Mountain Communications, Llc Dba Procom - Md | 12/27/2012 |
| 301 | 914 | Mc Henry | Landline | Mountain Communications, Llc Dba Procom - Md | 12/27/2012 |
| 301 | 914 | Oakland | Landline | Mountain Communications, Llc Dba Procom - Md | 12/27/2012 |
| 301 | 915 | Bethesda | Landline | Starpower Communications, Llc - Md | 11/20/1998 |
| 301 | 915 | Chevy Chase | Landline | Starpower Communications, Llc - Md | 11/20/1998 |
| 301 | 916 | Poolesville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 917 | Rockville | Landline | Starpower Communications, Llc - Md | 8/14/1998 |
| 301 | 918 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 918 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 918 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 919 | Bethesda | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 919 | Chevy Chase | Wireless | New Cingular Wireless Pcs, Llc - Dc | 2/4/1994 |
| 301 | 920 | Silver Spring | Landline | Starpower Communications, Llc - Md | 8/14/1998 |
| 301 | 921 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 921 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 922 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 4/15/1996 |
| 301 | 923 | Silver Spring | Wireless | Bandwidth.com Clec, Llc - Md | 9/11/1994 |
| 301 | 923 | Takoma Park | Wireless | Bandwidth.com Clec, Llc - Md | 9/11/1994 |
| 301 | 923 | Hyattsville | Wireless | Bandwidth.com Clec, Llc - Md | 9/11/1994 |
| 301 | 924 | Ashton | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 925 | Lanham | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 925 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 926 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 926 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 927 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 927 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 927 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 928 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/11/1995 |
| 301 | 929 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 929 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 930 | Silver Spring | Wireless | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 930 | Takoma Park | Wireless | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 931 | Silver Spring | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 931 | Beltsville | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 931 | Burtonsville | Landline | Verizon Maryland, Inc. | 7/4/1995 |
| 301 | 932 | La Plata | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 932 | Port Tobacco | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 932 | White Plains | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 933 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 933 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 934 | La Plata | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 934 | Port Tobacco | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 934 | White Plains | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 935 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 935 | Takoma Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 935 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 936 | Hagerstown | Landline | Telnyx Llc | 6/2/2017 |
| 301 | 937 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 937 | Beltsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 937 | Burtonsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 938 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 4/15/1996 |
| 301 | 939 | Laurel | Landline | Verizon Maryland, Inc. | 4/15/1996 |
| 301 | 940 | Silver Spring | Wireless | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 940 | Spencerville | Wireless | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 941 | Bethesda | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 941 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/11/1995 |
| 301 | 942 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 942 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 943 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 4/15/1996 |
| 301 | 944 | Gaithersburg | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 944 | Montgomery Village | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 945 | Takoma Park | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 945 | Hyattsville | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 945 | Mount Rainier | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 946 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 946 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 947 | Gaithersburg | Landline | Verizon Maryland, Inc. | 4/15/1996 |
| 301 | 947 | Montgomery Village | Landline | Verizon Maryland, Inc. | 4/15/1996 |
| 301 | 948 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 948 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 949 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 949 | Kensington | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 951 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 951 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 952 | Upper Marlboro | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 952 | Lothian | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 953 | Laurel | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 955 | Takoma Park | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 955 | Hyattsville | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 955 | Mount Rainier | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 956 | Rockville | Landline | Verizon Maryland, Inc. | 5/22/2002 |
| 301 | 957 | Laurel | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 960 | Silver Spring | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 961 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 961 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 962 | Silver Spring | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 962 | Kensington | Landline | Verizon Maryland, Inc. | 1/11/1997 |
| 301 | 963 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 963 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 964 | Myersville | Wireless | New Cingular Wireless Pcs, Llc - Dc | 4/15/1996 |
| 301 | 965 | Takoma Park | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 965 | Hyattsville | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 965 | Mount Rainier | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 966 | Takoma Park | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 966 | Hyattsville | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 966 | Mount Rainier | Landline | Mcimetro Access Transmission Services Llc | 11/20/1998 |
| 301 | 967 | Capitol Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 967 | Suitland | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 967 | District Heights | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 968 | Bethesda | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 968 | Chevy Chase | Landline | Mci Worldcom Communications, Inc. - Md | 7/4/1995 |
| 301 | 969 | Knoxville | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 3/6/2007 |
| 301 | 969 | Brunswick | Landline | Comcast Phone Of Northern Maryland, Inc. - Md | 3/6/2007 |
| 301 | 970 | Riva | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 970 | Annapolis | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 971 | Temple Hills | Landline | Starpower Communications, Llc - Md | 11/20/1998 |
| 301 | 971 | Fort Washington | Landline | Starpower Communications, Llc - Md | 11/20/1998 |
| 301 | 971 | Oxon Hill | Landline | Starpower Communications, Llc - Md | 11/20/1998 |
| 301 | 972 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 972 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 973 | Glenn Dale | Landline | Bandwidth.com Clec, Llc - Md | 2/4/1994 |
| 301 | 973 | Lanham | Landline | Bandwidth.com Clec, Llc - Md | 2/4/1994 |
| 301 | 973 | Bowie | Landline | Bandwidth.com Clec, Llc - Md | 2/4/1994 |
| 301 | 974 | Laurel | Landline | Starpower Communications, Llc - Md | 11/20/1998 |
| 301 | 975 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 975 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 976 | NA | Unknown | Baltimore-washington Telephone (bwt) | 10/17/2005 |
| 301 | 977 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 977 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 978 | Gaithersburg | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 978 | Montgomery Village | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 979 | Gaithersburg | Landline | Verizon Maryland, Inc. | 4/15/1996 |
| 301 | 979 | Montgomery Village | Landline | Verizon Maryland, Inc. | 4/15/1996 |
| 301 | 980 | Silver Spring | Wireless | Cellco Partnership Dba Verizon Wireless - Md | 2/4/1994 |
| 301 | 981 | Hyattsville | Landline | Level 3 Telecom Of Maryland, Llc - Md | 2/4/1994 |
| 301 | 981 | Mount Rainier | Landline | Level 3 Telecom Of Maryland, Llc - Md | 2/4/1994 |
| 301 | 981 | Brentwood | Landline | Level 3 Telecom Of Maryland, Llc - Md | 2/4/1994 |
| 301 | 982 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 982 | College Park | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 982 | Greenbelt | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 983 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 983 | Potomac | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 983 | Cabin John | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 984 | Rockville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 985 | Hyattsville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 985 | Bladensburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 985 | Riverdale | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 986 | Bethesda | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 986 | Chevy Chase | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 987 | Gaithersburg | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 987 | Montgomery Village | Landline | Verizon Maryland, Inc. | 10/11/1997 |
| 301 | 988 | Hagerstown | Wireless | Uscoc Of Cumberland, Inc. Dba United States Cel Md | 7/6/1997 |
| 301 | 989 | Silver Spring | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 989 | Spencerville | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 990 | Gaithersburg | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 990 | Montgomery Village | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 991 | Hagerstown | Wireless | Sprint Spectrum L.p. - Md | 4/15/1996 |
| 301 | 992 | Hagerstown | Wireless | Sprint Spectrum L.p. - Md | 10/11/1997 |
| 301 | 993 | Riverdale | Wireless | Verizon Maryland, Inc. | 11/20/1998 |
| 301 | 993 | College Park | Wireless | Verizon Maryland, Inc. | 11/20/1998 |
| 301 | 993 | Greenbelt | Wireless | Verizon Maryland, Inc. | 11/20/1998 |
| 301 | 994 | Drayden | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 994 | Piney Point | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 994 | Valley Lee | Landline | Verizon Maryland, Inc. | 2/4/1994 |
| 301 | 995 | Patuxent River | Landline | Verizon Maryland, Inc. | 8/14/1998 |
| 301 | 996 | Beltsville | Wireless | Sprint Spectrum L.p. | 1/10/1996 |
| 301 | 996 | Laurel | Wireless | Sprint Spectrum L.p. | 1/10/1996 |
| 301 | 997 | Leonardtown | Landline | Verizon Maryland, Inc. | 1/25/1998 |
| 301 | 998 | Rockville | Landline | Verizon Maryland, Inc. | 1/10/1996 |
See what our customer have to say about Teloz
By obtaining a virtual phone number with a 301 area code forwarded to my cell, my small boutique has established a local feel without costly hardware. Customers light up seeing a 301 number, leading to warm conversations that go beyond transactions. This simple virtual number has made my business part of the local community.
As an independent consultant based in India with clients worldwide, My 301 number gives my Upstate New York clients a local call experience, strengthening our relationships. Similarly, my New York 212 number has allowed me to better serve my Northeast US clients. And for my UK clients, my London 020 number has been crucial for establishing legitimacy. All this without needing physical offices in any of those regions. The local presence conveyed by these numbers has been key for growing my business internationally.
The advanced features like call recording, conferencing, and call handling have streamlined operations. I can now record calls with my team and share for training instead of repeating myself. The call forwarding lets me toggle between office and mobile seamlessly. And the conference calling bridges global team discussions. The capabilities and cost savings have been an absolute game changer compared to traditional telephony. These virtual numbers have opened my eyes to how a small business can efficiently compete on a global scale.
As an international sales rep, the flexibility of virtual phone numbers has been invaluable. I can instantly get local numbers when entering new markets to test demand, then easily cancel them if the market doesn't pan out. This agility to adjust my phone presence when pivoting between countries has saved tons of time and money compared to traditional telephony. The quick deployment and cancellation of virtual numbers has been a game-changer for optimizing my global sales.
Mike S. CorleyCEO 
Frequently Asked Questions
1. Can I port my existing phone number?
Yes, you can easily transfer your existing number to our system without any service interruption.
2. Are international calls included?
We offer competitive rates for international calls, allowing you to stay connected globally at an affordable cost.
3. Is there a long-term contract?
No, we offer month-to-month plans that provide you with the flexibility to adjust your services as needed.
4. What devices can I use with this service?
Our platform is compatible with smartphones, tablets, and computers, ensuring you can stay connected on your preferred device.
5. How quickly can I start using the service after signing up?
You can start calling and texting within minutes after completing the sign-up process.
6. Do you offer customer support?
Yes, we provide 24/7 customer support to assist you with any questions or issues you may encounter.
7. Can I customize my phone menus?
Absolutely! You can create custom greetings and multi-level menus to enhance your callers’ experience.
8. Is the system secure?
Yes, our platform features end-to-end encryption and adheres to the highest security standards to protect your communications.
9. How can I track my call and text activity?
Our platform offers real-time analytics, giving you insights into your communication patterns for better decision-making.
10. Do you support CRM integration?
Yes, our service seamlessly integrates with many popular CRM systems, allowing you to manage customer interactions efficiently.
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Teloz LTD
- +1 914-999-6826
- Contact Us
- www.teloz.com
- Office Address
ROOM 409, BEVERLEY COMMERCIAL, CENTRE, 87-105 CHATHAM ROAD
SOUTH, TSIM SHA TSUI, KOWLOON
HONG KONG
