Phone numbers in Washington, Maryland
Washington has 548 phone prefixes in area codes 227, 240, 301.
Biggest holders: Verizon (local phone), T-Mobile (including Sprint), Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 40%
- Local phone company 30%
- Internet / business phone carrier 27%
- Paging service 1%
- Phone company 2%
Every prefix in Washington
Search the first six digits of a number in this list. If it's here, the number started in Washington with the carrier shown. If it isn't, check the Maryland page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 227-200 | AT&T Mobility | Mobile carrier | 2023 |
| 227-205 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 227-206 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 227-224 | AT&T Mobility | Mobile carrier | 2023 |
| 227-228 | Onvoy | Internet / business phone carrier | 2024 |
| 227-229 | Onvoy | Internet / business phone carrier | 2024 |
| 227-230 | Onvoy | Internet / business phone carrier | 2024 |
| 227-231 | Onvoy | Internet / business phone carrier | 2024 |
| 227-233 | AT&T Mobility | Mobile carrier | 2024 |
| 227-246 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 227-248 | Onvoy | Internet / business phone carrier | 2024 |
| 227-249 | Bandwidth | Internet / business phone carrier | 2024 |
| 227-255 | Bandwidth | Internet / business phone carrier | 2024 |
| 227-256 | Onvoy | Internet / business phone carrier | 2024 |
| 227-261 | AT&T Mobility | Mobile carrier | 2024 |
| 227-265 | Onvoy | Internet / business phone carrier | 2024 |
| 227-266 | AT&T Mobility | Mobile carrier | 2024 |
| 227-269 | Onvoy | Internet / business phone carrier | 2025 |
| 227-275 | Verizon Wireless | Mobile carrier | 2025 |
| 227-276 | Onvoy | Internet / business phone carrier | 2025 |
| 227-301 | AT&T Mobility | Mobile carrier | 2026 |
| 227-302 | Boost / Virgin Mobile | Mobile carrier | 2026 |
| 227-307 | AT&T Mobility | Mobile carrier | 2026 |
| 227-308 | Onvoy | Internet / business phone carrier | 2026 |
| 227-313 | Onvoy | Internet / business phone carrier | 2026 |
| 227-321 | Onvoy | Internet / business phone carrier | 2026 |
| 227-322 | AT&T Mobility | Mobile carrier | 2026 |
| 227-323 | AT&T Mobility | Mobile carrier | 2026 |
| 227-444 | Onvoy | Internet / business phone carrier | 2025 |
| 227-727 | Onvoy | Internet / business phone carrier | 2024 |
| 227-772 | Onvoy | Internet / business phone carrier | 2024 |
| 227-997 | Verizon Wireless | Mobile carrier | 2025 |
| 227-998 | Verizon Wireless | Mobile carrier | 2024 |
| 240-200 | Bandwidth | Internet / business phone carrier | 2010 |
| 240-204 | Verizon Wireless | Mobile carrier | 2011 |
| 240-223 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 240-234 | Verizon Wireless | Mobile carrier | 2011 |
| 240-235 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-247 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 240-253 | Bandwidth | Internet / business phone carrier | – |
| 240-263 | AT&T Mobility | Mobile carrier | – |
| 240-265 | T-Mobile (including Sprint) | Mobile carrier | 2011 |
| 240-271 | AT&T Mobility | Mobile carrier | – |
| 240-272 | T-Mobile (including Sprint) | Mobile carrier | 2011 |
| 240-273 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-274 | AT&T Mobility | Mobile carrier | – |
| 240-277 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 240-281 | AT&T Mobility | Mobile carrier | – |
| 240-286 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 240-289 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-296 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-304 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 240-305 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-312 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-316 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-330 | T-Mobile (including Sprint) | Mobile carrier | 2007 |
| 240-331 | Peerless Network Of Maryland | Internet / business phone carrier | – |
| 240-333 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 240-336 | Core Communications | Internet / business phone carrier | – |
| 240-337 | Onvoy | Internet / business phone carrier | – |
| 240-338 | Verizon Wireless | Mobile carrier | – |
| 240-340 | T-Mobile (including Sprint) | Mobile carrier | 2011 |
| 240-350 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-351 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-353 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-354 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-355 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-370 | T-Mobile (including Sprint) | Mobile carrier | 2007 |
| 240-375 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-380 | Verizon Wireless | Mobile carrier | 2007 |
| 240-381 | AT&T Mobility | Mobile carrier | – |
| 240-383 | AT&T Mobility | Mobile carrier | – |
| 240-392 | Starpower Communications | Phone company | – |
| 240-393 | Verizon Wireless | Mobile carrier | – |
| 240-395 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-396 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-398 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 240-400 | T-Mobile (including Sprint) | Mobile carrier | 2011 |
| 240-413 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 240-414 | Peerless Network Of Maryland | Internet / business phone carrier | – |
| 240-417 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 240-418 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 240-423 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 240-424 | T-Mobile (including Sprint) | Mobile carrier | 2007 |
| 240-425 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-426 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 240-429 | Verizon Wireless | Mobile carrier | 2006 |
| 240-432 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-438 | T-Mobile (including Sprint) | Mobile carrier | 2011 |
| 240-441 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 240-443 | Onvoy | Internet / business phone carrier | 2020 |
| 240-445 | Onvoy | Internet / business phone carrier | – |
| 240-450 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-455 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 240-460 | AT&T Mobility | Mobile carrier | – |
| 240-461 | AT&T Mobility | Mobile carrier | – |
| 240-462 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-463 | AT&T Mobility | Mobile carrier | – |
| 240-464 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-465 | Peerless Network Of Maryland | Internet / business phone carrier | – |
| 240-467 | Comcast | Internet / business phone carrier | 2013 |
| 240-468 | T-Mobile (including Sprint) | Mobile carrier | 2007 |
| 240-472 | AT&T Mobility | Mobile carrier | – |
| 240-475 | AT&T Mobility | Mobile carrier | – |
| 240-476 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 240-478 | AT&T Mobility | Mobile carrier | 2004 |
| 240-479 | Verizon Wireless | Mobile carrier | 2008 |
| 240-480 | T-Mobile (including Sprint) | Mobile carrier | 2010 |
| 240-481 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 240-482 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-483 | Comcast | Internet / business phone carrier | – |
| 240-485 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-487 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-491 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-492 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-493 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-494 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 240-495 | Verizon Wireless | Mobile carrier | 2013 |
| 240-497 | Verizon (local phone) | Local phone company | – |
| 240-498 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-501 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 240-502 | Bandwidth | Internet / business phone carrier | – |
| 240-504 | T-Mobile (including Sprint) | Mobile carrier | 2011 |
| 240-505 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 240-507 | Verizon Wireless | Mobile carrier | 2008 |
| 240-508 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 240-515 | AT&T Mobility | Mobile carrier | 2001 |
| 240-519 | AT&T Mobility | Mobile carrier | – |
| 240-531 | Telnyx | Internet / business phone carrier | 2017 |
| 240-532 | Verizon Wireless | Mobile carrier | 2013 |
| 240-533 | Teleport Communications America | Internet / business phone carrier | – |
| 240-534 | Verizon Wireless | Mobile carrier | 2016 |
| 240-535 | AT&T Mobility | Mobile carrier | 2001 |
| 240-539 | Peerless Network Of Maryland | Internet / business phone carrier | – |
| 240-541 | AT&T Mobility | Mobile carrier | – |
| 240-543 | T-Mobile (including Sprint) | Mobile carrier | 2006 |
| 240-557 | T-Mobile (including Sprint) | Mobile carrier | 2017 |
| 240-563 | Onvoy | Internet / business phone carrier | 2017 |
| 240-582 | Verizon (local phone) | Local phone company | – |
| 240-595 | Verizon Wireless | Mobile carrier | 2006 |
| 240-600 | T-Mobile (including Sprint) | Mobile carrier | 2011 |
| 240-601 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-602 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-603 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-604 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-605 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-606 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-610 | Core Communications | Internet / business phone carrier | 2018 |
| 240-612 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-613 | Windstream (PAETEC) | Internet / business phone carrier | 2012 |
| 240-615 | MetroPCS (T-Mobile) | Mobile carrier | 2013 |
| 240-619 | Comcast | Internet / business phone carrier | – |
| 240-623 | Bandwidth | Internet / business phone carrier | 2014 |
| 240-630 | Bandwidth | Internet / business phone carrier | 2011 |
| 240-637 | Core Communications | Internet / business phone carrier | 2018 |
| 240-638 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-641 | Peerless Network Of Maryland | Internet / business phone carrier | – |
| 240-643 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 240-644 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 240-645 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 240-650 | Onvoy | Internet / business phone carrier | 2011 |
| 240-662 | Verizon (local phone) | Local phone company | – |
| 240-667 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-670 | Bandwidth | Internet / business phone carrier | – |
| 240-671 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-673 | Bandwidth | Internet / business phone carrier | 2019 |
| 240-676 | Verizon Wireless | Mobile carrier | – |
| 240-677 | MCImetro (Verizon Business) | Internet / business phone carrier | 2019 |
| 240-678 | Verizon Wireless | Mobile carrier | – |
| 240-687 | Verizon Wireless | Mobile carrier | – |
| 240-688 | Verizon Wireless | Mobile carrier | 2006 |
| 240-691 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-694 | Verizon (local phone) | Local phone company | – |
| 240-695 | Verizon (local phone) | Local phone company | – |
| 240-696 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-701 | AT&T Mobility | Mobile carrier | 2009 |
| 240-704 | AT&T Mobility | Mobile carrier | 2009 |
| 240-705 | AT&T Mobility | Mobile carrier | 2009 |
| 240-706 | AT&T Mobility | Mobile carrier | 2009 |
| 240-714 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 240-716 | T-Mobile (including Sprint) | Mobile carrier | 2013 |
| 240-719 | Verizon Wireless | Mobile carrier | 2016 |
| 240-721 | Verizon (local phone) | Local phone company | 2020 |
| 240-723 | Verizon Wireless | Mobile carrier | – |
| 240-724 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 240-726 | Nuso | Internet / business phone carrier | 2020 |
| 240-737 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 240-743 | Verizon Wireless | Mobile carrier | – |
| 240-744 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-748 | Teleport Communications America | Internet / business phone carrier | 2020 |
| 240-752 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-760 | Verizon Wireless | Mobile carrier | 2015 |
| 240-762 | Verizon Wireless | Mobile carrier | 2012 |
| 240-764 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 240-765 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 240-766 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 240-767 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 240-770 | Comcast | Internet / business phone carrier | 2004 |
| 240-781 | MCImetro (Verizon Business) | Internet / business phone carrier | 2015 |
| 240-783 | Mte Paging Network | Paging service | – |
| 240-788 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-791 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 240-795 | Verizon Wireless | Mobile carrier | 2021 |
| 240-800 | Core Communications | Internet / business phone carrier | 2012 |
| 240-802 | Nuso | Internet / business phone carrier | 2013 |
| 240-821 | Windstream (PAETEC) | Internet / business phone carrier | 2005 |
| 240-825 | Verizon Wireless | Mobile carrier | 2016 |
| 240-828 | Telnyx | Internet / business phone carrier | – |
| 240-830 | Comcast | Internet / business phone carrier | 2015 |
| 240-832 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-838 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 240-839 | Verizon Wireless | Mobile carrier | 2007 |
| 240-847 | Onvoy | Internet / business phone carrier | 2015 |
| 240-854 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 240-855 | T-Mobile (including Sprint) | Mobile carrier | 2006 |
| 240-857 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-858 | Verizon Wireless | Mobile carrier | 2016 |
| 240-863 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-867 | Commio | Internet / business phone carrier | 2017 |
| 240-872 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 240-876 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-879 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 240-882 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 240-886 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 240-890 | Verizon Wireless | Mobile carrier | 2021 |
| 240-893 | AT&T Mobility | Mobile carrier | – |
| 240-898 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 240-899 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 240-900 | Onvoy | Internet / business phone carrier | 2015 |
| 240-906 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-923 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 240-927 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 240-940 | Bandwidth | Internet / business phone carrier | 2022 |
| 240-941 | Bandwidth | Internet / business phone carrier | 2022 |
| 240-945 | Onvoy | Internet / business phone carrier | 2020 |
| 240-956 | Onvoy | Internet / business phone carrier | 2020 |
| 240-960 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 240-963 | Bandwidth | Internet / business phone carrier | 2022 |
| 240-977 | Onvoy | Internet / business phone carrier | 2023 |
| 240-988 | T-Mobile (including Sprint) | Mobile carrier | – |
| 240-997 | Verizon Wireless | Mobile carrier | – |
| 301-202 | AT&T Mobility | Mobile carrier | 2008 |
| 301-203 | Verizon (local phone) | Local phone company | – |
| 301-204 | AT&T Mobility | Mobile carrier | – |
| 301-209 | Verizon (local phone) | Local phone company | – |
| 301-213 | T-Mobile (including Sprint) | Mobile carrier | – |
| 301-214 | Verizon (local phone) | Local phone company | – |
| 301-215 | Verizon (local phone) | Local phone company | – |
| 301-219 | AT&T Mobility | Mobile carrier | – |
| 301-221 | AT&T Mobility | Mobile carrier | – |
| 301-222 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 301-224 | Spok | Paging service | – |
| 301-226 | Verizon (local phone) | Local phone company | – |
| 301-227 | Verizon (local phone) | Local phone company | – |
| 301-229 | Verizon (local phone) | Local phone company | – |
| 301-233 | Verizon Wireless | Mobile carrier | – |
| 301-237 | T-Mobile (including Sprint) | Mobile carrier | – |
| 301-239 | Verizon (local phone) | Local phone company | – |
| 301-243 | Verizon (local phone) | Local phone company | 2006 |
| 301-244 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 301-248 | Verizon (local phone) | Local phone company | – |
| 301-254 | T-Mobile (including Sprint) | Mobile carrier | – |
| 301-257 | T-Mobile (including Sprint) | Mobile carrier | – |
| 301-263 | Verizon (local phone) | Local phone company | – |
| 301-265 | Verizon (local phone) | Local phone company | – |
| 301-267 | T-Mobile (including Sprint) | Mobile carrier | 2011 |
| 301-269 | MCImetro (Verizon Business) | Internet / business phone carrier | 2014 |
| 301-270 | Verizon (local phone) | Local phone company | – |
| 301-272 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 301-273 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 301-275 | AT&T Mobility | Mobile carrier | – |
| 301-276 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 301-277 | Verizon (local phone) | Local phone company | – |
| 301-278 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 301-280 | Verizon (local phone) | Local phone company | – |
| 301-281 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 301-283 | Verizon (local phone) | Local phone company | – |
| 301-285 | Verizon (local phone) | Local phone company | – |
| 301-292 | Verizon (local phone) | Local phone company | – |
| 301-295 | Verizon (local phone) | Local phone company | – |
| 301-300 | Verizon Wireless | Mobile carrier | 2007 |
| 301-306 | Verizon (local phone) | Local phone company | – |
| 301-312 | AT&T Mobility | Mobile carrier | – |
| 301-314 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 301-316 | Verizon (local phone) | Local phone company | – |
| 301-318 | AT&T Mobility | Mobile carrier | – |
| 301-319 | Verizon (local phone) | Local phone company | – |
| 301-320 | Verizon (local phone) | Local phone company | – |
| 301-322 | Verizon (local phone) | Local phone company | – |
| 301-324 | Verizon (local phone) | Local phone company | – |
| 301-325 | Verizon Wireless | Mobile carrier | – |
| 301-326 | T-Mobile (including Sprint) | Mobile carrier | – |
| 301-328 | Comcast | Internet / business phone carrier | 2006 |
| 301-332 | AT&T Mobility | Mobile carrier | – |
| 301-333 | Verizon (local phone) | Local phone company | – |
| 301-335 | AT&T Mobility | Mobile carrier | – |
| 301-336 | Verizon (local phone) | Local phone company | – |
| 301-341 | Verizon (local phone) | Local phone company | – |
| 301-343 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 301-346 | AT&T Mobility | Mobile carrier | – |
| 301-347 | Verizon (local phone) | Local phone company | – |
| 301-350 | Verizon (local phone) | Local phone company | – |
| 301-351 | Verizon Wireless | Mobile carrier | – |
| 301-357 | Verizon Wireless | Mobile carrier | 2006 |
| 301-361 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 301-364 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 301-365 | Verizon (local phone) | Local phone company | – |
| 301-367 | Verizon Wireless | Mobile carrier | – |
| 301-379 | T-Mobile (including Sprint) | Mobile carrier | – |
| 301-380 | Verizon (local phone) | Local phone company | – |
| 301-381 | Onvoy | Internet / business phone carrier | 2022 |
| 301-385 | AT&T Mobility | Mobile carrier | – |
| 301-386 | Verizon (local phone) | Local phone company | – |
| 301-394 | Verizon (local phone) | Local phone company | – |
| 301-400 | Verizon (local phone) | Local phone company | 2010 |
| 301-402 | Verizon (local phone) | Local phone company | – |
| 301-403 | Verizon (local phone) | Local phone company | – |
| 301-404 | T-Mobile (including Sprint) | Mobile carrier | – |
| 301-405 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 301-406 | Spok | Paging service | – |
| 301-408 | Verizon (local phone) | Local phone company | – |
| 301-409 | Onvoy | Internet / business phone carrier | – |
| 301-410 | Onvoy | Internet / business phone carrier | 2022 |
| 301-412 | AT&T Mobility | Mobile carrier | – |
| 301-415 | Verizon (local phone) | Local phone company | – |
| 301-420 | Verizon (local phone) | Local phone company | – |
| 301-422 | Verizon (local phone) | Local phone company | – |
| 301-423 | Verizon (local phone) | Local phone company | – |
| 301-427 | Verizon (local phone) | Local phone company | – |
| 301-429 | Verizon (local phone) | Local phone company | – |
| 301-431 | Verizon (local phone) | Local phone company | – |
| 301-433 | Verizon (local phone) | Local phone company | – |
| 301-434 | Verizon (local phone) | Local phone company | – |
| 301-435 | Verizon (local phone) | Local phone company | – |
| 301-436 | Verizon (local phone) | Local phone company | – |
| 301-437 | T-Mobile (including Sprint) | Mobile carrier | – |
| 301-439 | Verizon (local phone) | Local phone company | – |
| 301-440 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 301-442 | T-Mobile (including Sprint) | Mobile carrier | – |
| 301-445 | Verizon (local phone) | Local phone company | – |
| 301-448 | Comcast | Internet / business phone carrier | – |
| 301-449 | Verizon (local phone) | Local phone company | – |
| 301-450 | AT&T Mobility | Mobile carrier | 2022 |
| 301-451 | Verizon (local phone) | Local phone company | – |
| 301-452 | Verizon Wireless | Mobile carrier | – |
| 301-454 | Verizon (local phone) | Local phone company | – |
| 301-455 | T-Mobile (including Sprint) | Mobile carrier | – |
| 301-456 | Comcast | Internet / business phone carrier | – |
| 301-457 | Verizon (local phone) | Local phone company | – |
| 301-458 | Teleport Communications America | Internet / business phone carrier | – |
| 301-459 | Verizon (local phone) | Local phone company | – |
| 301-466 | Verizon Wireless | Mobile carrier | – |
| 301-467 | Verizon Wireless | Mobile carrier | – |
| 301-469 | Verizon (local phone) | Local phone company | – |
| 301-480 | Verizon (local phone) | Local phone company | – |
| 301-484 | Comcast | Internet / business phone carrier | – |
| 301-485 | Comcast | Internet / business phone carrier | – |
| 301-492 | Verizon (local phone) | Local phone company | – |
| 301-493 | Verizon (local phone) | Local phone company | – |
| 301-495 | Verizon (local phone) | Local phone company | – |
| 301-496 | Verizon (local phone) | Local phone company | – |
| 301-499 | Verizon (local phone) | Local phone company | – |
| 301-500 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 301-502 | Verizon Wireless | Mobile carrier | – |
| 301-503 | AT&T Mobility | Mobile carrier | – |
| 301-504 | Verizon (local phone) | Local phone company | – |
| 301-505 | Verizon (local phone) | Local phone company | – |
| 301-509 | Verizon Wireless | Mobile carrier | – |
| 301-512 | Verizon Wireless | Mobile carrier | – |
| 301-516 | Verizon (local phone) | Local phone company | – |
| 301-518 | Verizon Wireless | Mobile carrier | – |
| 301-520 | Verizon Wireless | Mobile carrier | – |
| 301-521 | Verizon (local phone) | Local phone company | – |
| 301-523 | T-Mobile (including Sprint) | Mobile carrier | – |
| 301-526 | AT&T Mobility | Mobile carrier | – |
| 301-530 | Verizon (local phone) | Local phone company | – |
| 301-531 | Starpower Communications | Phone company | – |
| 301-537 | T-Mobile (including Sprint) | Mobile carrier | – |
| 301-538 | AT&T Mobility | Mobile carrier | – |
| 301-541 | Teleport Communications America | Internet / business phone carrier | – |
| 301-546 | Verizon (local phone) | Local phone company | 2014 |
| 301-547 | Teleport Communications America | Internet / business phone carrier | – |
| 301-551 | Baltimore-washington Telephone (bwt) | Phone company | – |
| 301-554 | Spok | Paging service | – |
| 301-557 | Level 3 (Lumen) | Internet / business phone carrier | 2011 |
| 301-559 | Verizon (local phone) | Local phone company | – |
| 301-560 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 301-561 | Baltimore-washington Telephone (bwt) | Phone company | – |
| 301-562 | Verizon (local phone) | Local phone company | – |
| 301-563 | Verizon (local phone) | Local phone company | – |
| 301-564 | Verizon (local phone) | Local phone company | – |
| 301-565 | Verizon (local phone) | Local phone company | – |
| 301-567 | Verizon (local phone) | Local phone company | – |
| 301-568 | Verizon (local phone) | Local phone company | – |
| 301-571 | Verizon (local phone) | Local phone company | – |
| 301-572 | Verizon (local phone) | Local phone company | – |
| 301-576 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 301-577 | Verizon (local phone) | Local phone company | – |
| 301-578 | Verizon (local phone) | Local phone company | – |
| 301-580 | Verizon Wireless | Mobile carrier | – |
Showing the first 400 of 548 prefixes.
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.