Phone numbers in Denver, Colorado
Denver has 1445 phone prefixes in area codes 303, 720, 983.
Biggest holders: CenturyLink / Lumen, T-Mobile (including Sprint), AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 29%
- Local phone company 37%
- Internet / business phone carrier 29%
- Paging service 3%
- Phone company 3%
Every prefix in Denver
Search the first six digits of a number in this list. If it's here, the number started in Denver with the carrier shown. If it isn't, check the Colorado page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 303-200 | Teleport Communications America | Internet / business phone carrier | – |
| 303-201 | Spok | Paging service | – |
| 303-202 | CenturyLink / Lumen | Local phone company | – |
| 303-203 | American Messaging Services | Paging service | – |
| 303-204 | Verizon Wireless | Mobile carrier | – |
| 303-205 | CenturyLink / Lumen | Local phone company | – |
| 303-206 | Spok | Paging service | – |
| 303-207 | Spok | Paging service | – |
| 303-208 | Spok | Paging service | – |
| 303-209 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-210 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-212 | American Messaging Services | Paging service | – |
| 303-213 | Spok | Paging service | – |
| 303-214 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-215 | CenturyLink / Lumen | Local phone company | – |
| 303-216 | CenturyLink / Lumen | Local phone company | – |
| 303-217 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-218 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-219 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-220 | CenturyLink / Lumen | Local phone company | – |
| 303-221 | CenturyLink / Lumen | Local phone company | – |
| 303-222 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-223 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-224 | CenturyLink / Lumen | Local phone company | – |
| 303-225 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-226 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-227 | CenturyLink / Lumen | Local phone company | – |
| 303-228 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-229 | Verizon Wireless | Mobile carrier | – |
| 303-230 | Spok | Paging service | – |
| 303-231 | CenturyLink / Lumen | Local phone company | – |
| 303-232 | CenturyLink / Lumen | Local phone company | – |
| 303-233 | CenturyLink / Lumen | Local phone company | – |
| 303-234 | CenturyLink / Lumen | Local phone company | – |
| 303-235 | CenturyLink / Lumen | Local phone company | – |
| 303-236 | CenturyLink / Lumen | Local phone company | – |
| 303-237 | CenturyLink / Lumen | Local phone company | – |
| 303-238 | CenturyLink / Lumen | Local phone company | – |
| 303-239 | CenturyLink / Lumen | Local phone company | – |
| 303-240 | Spok | Paging service | – |
| 303-241 | Verizon Wireless | Mobile carrier | – |
| 303-242 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-243 | N.e. Colorado Cellular | Mobile carrier | – |
| 303-244 | CenturyLink / Lumen | Local phone company | – |
| 303-245 | CenturyLink / Lumen | Local phone company | – |
| 303-246 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-247 | CenturyLink / Lumen | Local phone company | – |
| 303-248 | Teleport Communications America | Internet / business phone carrier | – |
| 303-249 | AT&T Mobility | Mobile carrier | – |
| 303-250 | AT&T Mobility | Mobile carrier | – |
| 303-251 | Spok | Paging service | – |
| 303-252 | CenturyLink / Lumen | Local phone company | – |
| 303-253 | Teleport Communications America | Internet / business phone carrier | – |
| 303-254 | CenturyLink / Lumen | Local phone company | – |
| 303-255 | CenturyLink / Lumen | Local phone company | – |
| 303-256 | Teleport Communications America | Internet / business phone carrier | – |
| 303-257 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-258 | CenturyLink / Lumen | Local phone company | – |
| 303-259 | American Messaging Services | Paging service | – |
| 303-260 | CenturyLink / Lumen | Local phone company | – |
| 303-261 | CenturyLink / Lumen | Local phone company | – |
| 303-262 | Teleport Communications America | Internet / business phone carrier | – |
| 303-263 | Verizon Wireless | Mobile carrier | – |
| 303-264 | Teleport Communications America | Internet / business phone carrier | – |
| 303-265 | CenturyLink / Lumen | Local phone company | – |
| 303-266 | Spok | Paging service | – |
| 303-267 | CenturyLink / Lumen | Local phone company | – |
| 303-268 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-269 | CenturyLink / Lumen | Local phone company | – |
| 303-270 | CenturyLink / Lumen | Local phone company | – |
| 303-271 | CenturyLink / Lumen | Local phone company | – |
| 303-272 | CenturyLink / Lumen | Local phone company | – |
| 303-273 | CenturyLink / Lumen | Local phone company | – |
| 303-274 | CenturyLink / Lumen | Local phone company | – |
| 303-275 | CenturyLink / Lumen | Local phone company | – |
| 303-276 | Onvoy | Internet / business phone carrier | 2021 |
| 303-277 | CenturyLink / Lumen | Local phone company | – |
| 303-278 | CenturyLink / Lumen | Local phone company | – |
| 303-279 | CenturyLink / Lumen | Local phone company | – |
| 303-280 | CenturyLink / Lumen | Local phone company | – |
| 303-281 | CenturyLink / Lumen | Local phone company | – |
| 303-282 | CenturyLink / Lumen | Local phone company | – |
| 303-283 | CenturyLink / Lumen | Local phone company | – |
| 303-284 | Comcast | Internet / business phone carrier | – |
| 303-285 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-286 | CenturyLink / Lumen | Local phone company | – |
| 303-287 | CenturyLink / Lumen | Local phone company | – |
| 303-288 | CenturyLink / Lumen | Local phone company | – |
| 303-289 | CenturyLink / Lumen | Local phone company | – |
| 303-290 | CenturyLink / Lumen | Local phone company | – |
| 303-291 | CenturyLink / Lumen | Local phone company | – |
| 303-292 | CenturyLink / Lumen | Local phone company | – |
| 303-293 | CenturyLink / Lumen | Local phone company | – |
| 303-294 | CenturyLink / Lumen | Local phone company | – |
| 303-295 | CenturyLink / Lumen | Local phone company | – |
| 303-296 | CenturyLink / Lumen | Local phone company | – |
| 303-297 | CenturyLink / Lumen | Local phone company | – |
| 303-298 | CenturyLink / Lumen | Local phone company | – |
| 303-299 | CenturyLink / Lumen | Local phone company | – |
| 303-300 | CenturyLink / Lumen | Local phone company | – |
| 303-301 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-302 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-303 | Hd Carrier | Internet / business phone carrier | 2024 |
| 303-305 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-306 | CenturyLink / Lumen | Local phone company | – |
| 303-307 | CenturyLink / Lumen | Local phone company | – |
| 303-308 | CenturyLink / Lumen | Local phone company | – |
| 303-309 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-310 | American Messaging Services | Paging service | – |
| 303-312 | CenturyLink / Lumen | Local phone company | – |
| 303-313 | CenturyLink / Lumen | Local phone company | – |
| 303-314 | CenturyLink / Lumen | Local phone company | – |
| 303-315 | CenturyLink / Lumen | Local phone company | – |
| 303-316 | CenturyLink / Lumen | Local phone company | – |
| 303-317 | CenturyLink / Lumen | Local phone company | – |
| 303-318 | CenturyLink / Lumen | Local phone company | – |
| 303-319 | Elbert County Wireless | Mobile carrier | 2004 |
| 303-320 | CenturyLink / Lumen | Local phone company | – |
| 303-321 | CenturyLink / Lumen | Local phone company | – |
| 303-322 | CenturyLink / Lumen | Local phone company | – |
| 303-323 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-324 | AT&T Mobility | Mobile carrier | – |
| 303-325 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-326 | CenturyLink / Lumen | Local phone company | – |
| 303-327 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-328 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-329 | CenturyLink / Lumen | Local phone company | – |
| 303-330 | Onvoy | Internet / business phone carrier | 2006 |
| 303-331 | CenturyLink / Lumen | Local phone company | – |
| 303-332 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-333 | CenturyLink / Lumen | Local phone company | – |
| 303-334 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-335 | Verizon Wireless | Mobile carrier | – |
| 303-336 | CenturyLink / Lumen | Local phone company | – |
| 303-337 | CenturyLink / Lumen | Local phone company | – |
| 303-338 | CenturyLink / Lumen | Local phone company | – |
| 303-339 | Onvoy | Internet / business phone carrier | – |
| 303-340 | CenturyLink / Lumen | Local phone company | – |
| 303-341 | CenturyLink / Lumen | Local phone company | – |
| 303-342 | CenturyLink / Lumen | Local phone company | – |
| 303-343 | CenturyLink / Lumen | Local phone company | – |
| 303-344 | CenturyLink / Lumen | Local phone company | – |
| 303-345 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-346 | CenturyLink / Lumen | Local phone company | – |
| 303-347 | CenturyLink / Lumen | Local phone company | – |
| 303-348 | CenturyLink / Lumen | Local phone company | – |
| 303-349 | Verizon Wireless | Mobile carrier | – |
| 303-350 | AT&T Mobility | Mobile carrier | – |
| 303-352 | CenturyLink / Lumen | Local phone company | – |
| 303-353 | Comcast | Internet / business phone carrier | – |
| 303-354 | Teleport Communications America | Internet / business phone carrier | – |
| 303-355 | CenturyLink / Lumen | Local phone company | – |
| 303-356 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-357 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-358 | Verizon Wireless | Mobile carrier | – |
| 303-359 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-360 | CenturyLink / Lumen | Local phone company | – |
| 303-361 | CenturyLink / Lumen | Local phone company | – |
| 303-362 | Teleport Communications America | Internet / business phone carrier | – |
| 303-363 | CenturyLink / Lumen | Local phone company | – |
| 303-364 | CenturyLink / Lumen | Local phone company | – |
| 303-365 | CenturyLink / Lumen | Local phone company | – |
| 303-366 | CenturyLink / Lumen | Local phone company | – |
| 303-367 | CenturyLink / Lumen | Local phone company | – |
| 303-368 | CenturyLink / Lumen | Local phone company | – |
| 303-369 | CenturyLink / Lumen | Local phone company | – |
| 303-370 | CenturyLink / Lumen | Local phone company | – |
| 303-371 | CenturyLink / Lumen | Local phone company | – |
| 303-372 | CenturyLink / Lumen | Local phone company | – |
| 303-373 | CenturyLink / Lumen | Local phone company | – |
| 303-374 | Teleport Communications America | Internet / business phone carrier | – |
| 303-375 | CenturyLink / Lumen | Local phone company | – |
| 303-376 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-377 | CenturyLink / Lumen | Local phone company | – |
| 303-378 | AT&T Mobility | Mobile carrier | – |
| 303-379 | Teleport Communications America | Internet / business phone carrier | – |
| 303-380 | CenturyLink / Lumen | Local phone company | – |
| 303-381 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-382 | CenturyLink / Lumen | Local phone company | – |
| 303-383 | CenturyLink / Lumen | Local phone company | – |
| 303-384 | CenturyLink / Lumen | Local phone company | – |
| 303-385 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-386 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-387 | CenturyLink / Lumen | Local phone company | – |
| 303-388 | CenturyLink / Lumen | Local phone company | – |
| 303-389 | CenturyLink / Lumen | Local phone company | – |
| 303-390 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-391 | CenturyLink / Lumen | Local phone company | – |
| 303-392 | Verizon Wireless | Mobile carrier | 2025 |
| 303-393 | CenturyLink / Lumen | Local phone company | – |
| 303-394 | CenturyLink / Lumen | Local phone company | – |
| 303-395 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-396 | Live Wire Networks | Phone company | 2005 |
| 303-397 | CenturyLink / Lumen | Local phone company | – |
| 303-398 | CenturyLink / Lumen | Local phone company | – |
| 303-399 | CenturyLink / Lumen | Local phone company | – |
| 303-400 | CenturyLink / Lumen | Local phone company | – |
| 303-401 | CenturyLink / Lumen | Local phone company | – |
| 303-402 | CenturyLink / Lumen | Local phone company | – |
| 303-403 | CenturyLink / Lumen | Local phone company | – |
| 303-404 | CenturyLink / Lumen | Local phone company | – |
| 303-405 | CenturyLink / Lumen | Local phone company | – |
| 303-406 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-407 | Onvoy | Internet / business phone carrier | – |
| 303-408 | AT&T Mobility | Mobile carrier | – |
| 303-409 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-410 | CenturyLink / Lumen | Local phone company | – |
| 303-412 | CenturyLink / Lumen | Local phone company | – |
| 303-413 | CenturyLink / Lumen | Local phone company | – |
| 303-414 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-415 | CenturyLink / Lumen | Local phone company | – |
| 303-416 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-417 | CenturyLink / Lumen | Local phone company | – |
| 303-418 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-419 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-420 | CenturyLink / Lumen | Local phone company | – |
| 303-421 | CenturyLink / Lumen | Local phone company | – |
| 303-422 | CenturyLink / Lumen | Local phone company | – |
| 303-423 | CenturyLink / Lumen | Local phone company | – |
| 303-424 | CenturyLink / Lumen | Local phone company | – |
| 303-425 | CenturyLink / Lumen | Local phone company | – |
| 303-426 | CenturyLink / Lumen | Local phone company | – |
| 303-427 | CenturyLink / Lumen | Local phone company | – |
| 303-428 | CenturyLink / Lumen | Local phone company | – |
| 303-429 | CenturyLink / Lumen | Local phone company | – |
| 303-430 | CenturyLink / Lumen | Local phone company | – |
| 303-431 | CenturyLink / Lumen | Local phone company | – |
| 303-432 | CenturyLink / Lumen | Local phone company | – |
| 303-433 | CenturyLink / Lumen | Local phone company | – |
| 303-434 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-435 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-436 | CenturyLink / Lumen | Local phone company | – |
| 303-437 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-438 | CenturyLink / Lumen | Local phone company | – |
| 303-439 | CenturyLink / Lumen | Local phone company | – |
| 303-440 | CenturyLink / Lumen | Local phone company | – |
| 303-441 | CenturyLink / Lumen | Local phone company | – |
| 303-442 | CenturyLink / Lumen | Local phone company | – |
| 303-443 | CenturyLink / Lumen | Local phone company | – |
| 303-444 | CenturyLink / Lumen | Local phone company | – |
| 303-445 | CenturyLink / Lumen | Local phone company | – |
| 303-446 | CenturyLink / Lumen | Local phone company | – |
| 303-447 | CenturyLink / Lumen | Local phone company | – |
| 303-448 | CenturyLink / Lumen | Local phone company | – |
| 303-449 | CenturyLink / Lumen | Local phone company | – |
| 303-450 | CenturyLink / Lumen | Local phone company | – |
| 303-451 | CenturyLink / Lumen | Local phone company | – |
| 303-452 | CenturyLink / Lumen | Local phone company | – |
| 303-453 | CenturyLink / Lumen | Local phone company | – |
| 303-454 | CenturyLink / Lumen | Local phone company | – |
| 303-455 | CenturyLink / Lumen | Local phone company | – |
| 303-456 | CenturyLink / Lumen | Local phone company | – |
| 303-457 | CenturyLink / Lumen | Local phone company | – |
| 303-458 | CenturyLink / Lumen | Local phone company | – |
| 303-459 | CenturyLink / Lumen | Local phone company | – |
| 303-460 | CenturyLink / Lumen | Local phone company | – |
| 303-461 | Spok | Paging service | – |
| 303-462 | CenturyLink / Lumen | Local phone company | – |
| 303-463 | CenturyLink / Lumen | Local phone company | – |
| 303-464 | CenturyLink / Lumen | Local phone company | – |
| 303-465 | CenturyLink / Lumen | Local phone company | – |
| 303-466 | CenturyLink / Lumen | Local phone company | – |
| 303-467 | CenturyLink / Lumen | Local phone company | – |
| 303-468 | Onvoy | Internet / business phone carrier | – |
| 303-469 | CenturyLink / Lumen | Local phone company | – |
| 303-470 | CenturyLink / Lumen | Local phone company | – |
| 303-471 | CenturyLink / Lumen | Local phone company | – |
| 303-472 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-473 | CenturyLink / Lumen | Local phone company | – |
| 303-474 | Teleport Communications America | Internet / business phone carrier | – |
| 303-475 | AT&T Mobility | Mobile carrier | – |
| 303-476 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-477 | CenturyLink / Lumen | Local phone company | – |
| 303-478 | AT&T Mobility | Mobile carrier | – |
| 303-479 | Teleport Communications America | Internet / business phone carrier | – |
| 303-480 | CenturyLink / Lumen | Local phone company | – |
| 303-481 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-482 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-483 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-484 | Teleport Communications America | Internet / business phone carrier | – |
| 303-486 | CenturyLink / Lumen | Local phone company | – |
| 303-487 | CenturyLink / Lumen | Local phone company | – |
| 303-488 | CenturyLink / Lumen | Local phone company | – |
| 303-489 | Verizon Wireless | Mobile carrier | – |
| 303-490 | Spok | Paging service | – |
| 303-491 | Onvoy | Internet / business phone carrier | 2022 |
| 303-492 | CenturyLink / Lumen | Local phone company | – |
| 303-493 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-494 | CenturyLink / Lumen | Local phone company | – |
| 303-495 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-496 | MCImetro (Verizon Business) | Internet / business phone carrier | 2004 |
| 303-497 | CenturyLink / Lumen | Local phone company | – |
| 303-498 | Comcast | Internet / business phone carrier | 2005 |
| 303-499 | CenturyLink / Lumen | Local phone company | – |
| 303-501 | Verizon Wireless | Mobile carrier | 2006 |
| 303-503 | Verizon Wireless | Mobile carrier | – |
| 303-504 | CenturyLink / Lumen | Local phone company | – |
| 303-505 | T-Mobile (including Sprint) | Mobile carrier | 2012 |
| 303-507 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-508 | American Messaging Services | Paging service | – |
| 303-509 | American Messaging Services | Paging service | – |
| 303-510 | American Messaging Services | Paging service | – |
| 303-512 | CenturyLink / Lumen | Local phone company | – |
| 303-513 | AT&T Mobility | Mobile carrier | 2002 |
| 303-514 | Verizon Wireless | Mobile carrier | – |
| 303-515 | Onvoy | Internet / business phone carrier | 2011 |
| 303-516 | CenturyLink / Lumen | Local phone company | – |
| 303-517 | AT&T Mobility | Mobile carrier | – |
| 303-518 | Verizon Wireless | Mobile carrier | – |
| 303-519 | Verizon Wireless | Mobile carrier | – |
| 303-520 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-521 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-522 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-523 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-524 | Teleport Communications America | Internet / business phone carrier | – |
| 303-525 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-526 | CenturyLink / Lumen | Local phone company | – |
| 303-527 | CenturyLink / Lumen | Local phone company | – |
| 303-528 | American Messaging Services | Paging service | – |
| 303-529 | Onvoy | Internet / business phone carrier | 2019 |
| 303-530 | CenturyLink / Lumen | Local phone company | – |
| 303-531 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-533 | CenturyLink / Lumen | Local phone company | – |
| 303-534 | CenturyLink / Lumen | Local phone company | – |
| 303-537 | Teleport Communications America | Internet / business phone carrier | – |
| 303-538 | CenturyLink / Lumen | Local phone company | – |
| 303-539 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-540 | Spok | Paging service | – |
| 303-541 | CenturyLink / Lumen | Local phone company | – |
| 303-542 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-543 | CenturyLink / Lumen | Local phone company | – |
| 303-544 | CenturyLink / Lumen | Local phone company | – |
| 303-545 | CenturyLink / Lumen | Local phone company | – |
| 303-546 | CenturyLink / Lumen | Local phone company | – |
| 303-547 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-548 | Verizon Wireless | Mobile carrier | – |
| 303-549 | Verizon Wireless | Mobile carrier | – |
| 303-550 | Verizon Wireless | Mobile carrier | – |
| 303-551 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-552 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-553 | Spok | Paging service | – |
| 303-554 | CenturyLink / Lumen | Local phone company | – |
| 303-556 | CenturyLink / Lumen | Local phone company | – |
| 303-557 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-558 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-559 | American Messaging Services | Paging service | – |
| 303-560 | Spok | Paging service | – |
| 303-561 | CenturyLink / Lumen | Local phone company | – |
| 303-562 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-563 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-564 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-565 | Onvoy | Internet / business phone carrier | – |
| 303-566 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 303-567 | CenturyLink / Lumen | Local phone company | – |
| 303-568 | Teleport Communications America | Internet / business phone carrier | – |
| 303-570 | AT&T Mobility | Mobile carrier | – |
| 303-571 | CenturyLink / Lumen | Local phone company | – |
| 303-572 | CenturyLink / Lumen | Local phone company | – |
| 303-573 | CenturyLink / Lumen | Local phone company | – |
| 303-574 | CenturyLink / Lumen | Local phone company | – |
| 303-575 | CenturyLink / Lumen | Local phone company | – |
| 303-576 | CenturyLink / Lumen | Local phone company | – |
| 303-577 | Allstream | Internet / business phone carrier | – |
| 303-579 | Verizon Wireless | Mobile carrier | – |
| 303-580 | American Messaging Services | Paging service | – |
| 303-581 | CenturyLink / Lumen | Local phone company | – |
| 303-582 | CenturyLink / Lumen | Local phone company | – |
| 303-583 | Teleport Communications America | Internet / business phone carrier | – |
| 303-584 | CenturyLink / Lumen | Local phone company | – |
| 303-585 | CenturyLink / Lumen | Local phone company | – |
| 303-586 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-587 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-588 | AT&T Mobility | Mobile carrier | – |
| 303-589 | AT&T Mobility | Mobile carrier | – |
| 303-590 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 303-591 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-592 | CenturyLink / Lumen | Local phone company | – |
| 303-593 | Teleport Communications America | Internet / business phone carrier | – |
| 303-594 | Verizon Wireless | Mobile carrier | – |
| 303-595 | CenturyLink / Lumen | Local phone company | – |
| 303-596 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-597 | Allstream | Internet / business phone carrier | – |
| 303-598 | T-Mobile (including Sprint) | Mobile carrier | – |
| 303-599 | Spok | Paging service | – |
| 303-600 | Teleport Communications America | Internet / business phone carrier | – |
| 303-601 | AT&T Mobility | Mobile carrier | – |
| 303-602 | CenturyLink / Lumen | Local phone company | – |
| 303-603 | CenturyLink / Lumen | Local phone company | – |
| 303-604 | CenturyLink / Lumen | Local phone company | – |
| 303-605 | CenturyLink / Lumen | Local phone company | – |
| 303-606 | CenturyLink / Lumen | Local phone company | – |
| 303-607 | CenturyLink / Lumen | Local phone company | – |
| 303-608 | CenturyLink / Lumen | Local phone company | – |
| 303-609 | Spok | Paging service | – |
| 303-610 | Spok | Paging service | – |
| 303-612 | Spok | Paging service | – |
| 303-613 | Spok | Paging service | – |
| 303-614 | CenturyLink / Lumen | Local phone company | – |
| 303-615 | CenturyLink / Lumen | Local phone company | – |
| 303-617 | CenturyLink / Lumen | Local phone company | – |
Showing the first 400 of 1445 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.