303 Area Code: Location, Cities, Map And Time Zone

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Area code 303 is in Colorado, USA , spanning 14 counties and serving 74 cities , including Denver, Aurora or Lakewood; it currently uses 784 prefixes , assigned from 303-200-XXXX through 303-999-XXXX.

In service since January 01, 1947, area code 303 is the parent Numbering Plan Area in overlay complex 303/720/983.

The current local time is .

303 area code location on a map
© OpenStreetMap contributorsFor exact NPA boundaries see official 303 area code map

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More Colorado area codes:

  • 719
  • 720
  • 748
  • 970
  • 983

Locate any 303-NXX prefix:

303-200-XXXX --- 303-299-XXXX
NPANXX Carrier1 Area Served2 Date3
303-200 Teleport Communications America Denver N/A
303-201 USA Mobility Wireless Denver N/A
303-202 Qwest Corporation Denver N/A
303-203 American Messaging Services Denver N/A
303-204 Cellco Partnership Denver N/A
303-205 Qwest Corporation Denver N/A
303-206 USA Mobility Wireless Denver N/A
303-207 USA Mobility Wireless Denver N/A
303-208 USA Mobility Wireless Denver N/A
303-209 MCIMetro Access Transmission Services Denver N/A
303-210 T-Mobile USA Denver N/A
303-212 American Messaging Services Denver N/A
303-213 USA Mobility Wireless Denver N/A
303-214 MCIMetro Access Transmission Services Denver N/A
303-215 Qwest Corporation Denver N/A
303-216 Qwest Corporation Denver N/A
303-217 MCIMetro Access Transmission Services Denver N/A
303-218 MCIMetro Access Transmission Services Denver N/A
303-219 MCIMetro Access Transmission Services Denver N/A
303-220 Qwest Corporation Denver N/A
303-221 Qwest Corporation Denver N/A
303-222 MCIMetro Access Transmission Services Denver N/A
303-223 Level 3 Communications Denver N/A
303-224 Qwest Corporation Denver N/A
303-225 Level 3 Communications Denver N/A
303-226 Level 3 Communications Denver N/A
303-227 Qwest Corporation Denver N/A
303-228 Level 3 Communications Denver N/A
303-229 Cellco Partnership Denver N/A
303-230 USA Mobility Wireless Denver N/A
303-231 Qwest Corporation Denver N/A
303-232 Qwest Corporation Denver N/A
303-233 Qwest Corporation Denver N/A
303-234 Qwest Corporation Denver N/A
303-235 Qwest Corporation Denver N/A
303-236 Qwest Corporation Denver N/A
303-237 Qwest Corporation Denver N/A
303-238 Qwest Corporation Denver N/A
303-239 Qwest Corporation Denver N/A
303-240 USA Mobility Wireless Denver N/A
303-241 Cellco Partnership Denver N/A
303-242 MCIMetro Access Transmission Services Denver N/A
303-243 N.e. Colorado Cellular Denver N/A
303-244 Qwest Corporation Denver N/A
303-245 Qwest Corporation Denver N/A
303-246 T-Mobile USA Denver N/A
303-247 Qwest Corporation Denver N/A
303-248 Teleport Communications America Denver N/A
303-249 New Cingular Wireless PCS Denver N/A
303-250 New Cingular Wireless PCS Denver N/A
303-251 USA Mobility Wireless Denver N/A
303-252 Qwest Corporation Denver N/A
303-253 Teleport Communications America Denver N/A
303-254 Qwest Corporation Denver N/A
303-255 Qwest Corporation Denver N/A
303-256 Teleport Communications America Denver N/A
303-257 T-Mobile USA Denver N/A
303-258 Qwest Corporation Denver N/A
303-259 American Messaging Services Denver N/A
303-260 Qwest Corporation Denver N/A
303-261 Qwest Corporation Denver N/A
303-262 Teleport Communications America Denver N/A
303-263 Cellco Partnership Denver N/A
303-264 Teleport Communications America Denver N/A
303-265 Qwest Corporation Denver N/A
303-266 USA Mobility Wireless Denver N/A
303-267 Qwest Corporation Denver N/A
303-268 Level 3 Communications Denver N/A
303-269 Qwest Corporation Denver N/A
303-270 Qwest Corporation Denver N/A
303-271 Qwest Corporation Denver N/A
303-272 Qwest Corporation Denver N/A
303-273 Qwest Corporation Denver N/A
303-274 Qwest Corporation Denver N/A
303-275 Qwest Corporation Denver N/A
303-276 Onvoy Denver 8/19/2021
303-277 Qwest Corporation Denver N/A
303-278 Qwest Corporation Denver N/A
303-279 Qwest Corporation Denver N/A
303-280 Qwest Corporation Denver N/A
303-281 Qwest Corporation Denver N/A
303-282 Qwest Corporation Denver N/A
303-283 Qwest Corporation Denver N/A
303-284 Comcast IP Phone Denver N/A
303-285 Level 3 Communications Denver N/A
303-286 Qwest Corporation Denver N/A
303-287 Qwest Corporation Denver N/A
303-288 Qwest Corporation Denver N/A
303-289 Qwest Corporation Denver N/A
303-290 Qwest Corporation Denver N/A
303-291 Qwest Corporation Denver N/A
303-292 Qwest Corporation Denver N/A
303-293 Qwest Corporation Denver N/A
303-294 Qwest Corporation Denver N/A
303-295 Qwest Corporation Denver N/A
303-296 Qwest Corporation Denver N/A
303-297 Qwest Corporation Denver N/A
303-298 Qwest Corporation Denver N/A
303-299 Qwest Corporation Denver N/A
303-300-XXXX --- 303-399-XXXX
NPANXX Carrier1 Area Served2 Date3
303-300 Qwest Corporation Denver N/A
303-301 Level 3 Communications Denver N/A
303-302 MCIMetro Access Transmission Services Denver N/A
303-303 HD Carrier Denver 08/26/2024
303-304 New Cingular Wireless PCS Fort Lupton 11/18/2004
303-305 MCIMetro Access Transmission Services Denver N/A
303-306 Qwest Corporation Denver N/A
303-307 Qwest Corporation Denver N/A
303-308 Qwest Corporation Denver N/A
303-309 Level 3 Communications Denver N/A
303-310 American Messaging Services Denver N/A
303-312 Qwest Corporation Denver N/A
303-313 Qwest Corporation Denver N/A
303-314 Qwest Corporation Denver N/A
303-315 Qwest Corporation Denver N/A
303-316 Qwest Corporation Denver N/A
303-317 Qwest Corporation Denver N/A
303-318 Qwest Corporation Denver N/A
303-319 Elbert County Wireless Denver 8/12/2004
303-320 Qwest Corporation Denver N/A
303-321 Qwest Corporation Denver N/A
303-322 Qwest Corporation Denver N/A
303-323 MCIMetro Access Transmission Services Denver N/A
303-324 New Cingular Wireless PCS Denver N/A
303-325 Level 3 Communications Denver N/A
303-326 Qwest Corporation Denver N/A
303-327 Level 3 Communications Denver N/A
303-328 MCIMetro Access Transmission Services Denver N/A
303-329 Qwest Corporation Denver N/A
303-330 Onvoy Denver 3/9/2006
303-331 Qwest Corporation Denver N/A
303-332 T-Mobile USA Denver N/A
303-333 Qwest Corporation Denver N/A
303-334 MCIMetro Access Transmission Services Denver N/A
303-335 Cellco Partnership Denver N/A
303-336 Qwest Corporation Denver N/A
303-337 Qwest Corporation Denver N/A
303-338 Qwest Corporation Denver N/A
303-339 Onvoy Denver 12/15/2003
303-340 Qwest Corporation Denver N/A
303-341 Qwest Corporation Denver N/A
303-342 Qwest Corporation Denver N/A
303-343 Qwest Corporation Denver N/A
303-344 Qwest Corporation Denver N/A
303-345 Level 3 Communications Denver N/A
303-346 Qwest Corporation Denver N/A
303-347 Qwest Corporation Denver N/A
303-348 Qwest Corporation Denver N/A
303-349 Cellco Partnership Denver N/A
303-350 New Cingular Wireless PCS Denver N/A
303-351 Onvoy Deckers 11/8/2006
303-352 Qwest Corporation Denver N/A
303-353 Comcast IP Phone Denver N/A
303-354 Teleport Communications America Denver N/A
303-355 Qwest Corporation Denver N/A
303-356 T-Mobile USA Denver N/A
303-357 MCIMetro Access Transmission Services Denver N/A
303-358 Cellco Partnership Denver N/A
303-359 T-Mobile USA Denver N/A
303-360 Qwest Corporation Denver N/A
303-361 Qwest Corporation Denver N/A
303-362 Teleport Communications America Denver N/A
303-363 Qwest Corporation Denver N/A
303-364 Qwest Corporation Denver N/A
303-365 Qwest Corporation Denver N/A
303-366 Qwest Corporation Denver N/A
303-367 Qwest Corporation Denver N/A
303-368 Qwest Corporation Denver N/A
303-369 Qwest Corporation Denver N/A
303-370 Qwest Corporation Denver N/A
303-371 Qwest Corporation Denver N/A
303-372 Qwest Corporation Denver N/A
303-373 Qwest Corporation Denver N/A
303-374 Teleport Communications America Denver N/A
303-375 Qwest Corporation Denver N/A
303-376 Level 3 Communications Denver N/A
303-377 Qwest Corporation Denver N/A
303-378 New Cingular Wireless PCS Denver N/A
303-379 Teleport Communications America Denver N/A
303-380 Qwest Corporation Denver N/A
303-381 Level 3 Communications Denver N/A
303-382 Qwest Corporation Denver N/A
303-383 Qwest Corporation Denver N/A
303-384 Qwest Corporation Denver N/A
303-385 Level 3 Communications Denver N/A
303-386 Level 3 Communications Denver N/A
303-387 Qwest Corporation Denver N/A
303-388 Qwest Corporation Denver N/A
303-389 Qwest Corporation Denver N/A
303-390 MCIMetro Access Transmission Services Denver N/A
303-391 Qwest Corporation Denver N/A
303-392 Cellco Partnership Denver 01/16/2025
303-393 Qwest Corporation Denver N/A
303-394 Qwest Corporation Denver N/A
303-395 Level 3 Communications Denver N/A
303-396 Live Wire Networks Denver 6/1/2005
303-397 Qwest Corporation Denver N/A
303-398 Qwest Corporation Denver N/A
303-399 Qwest Corporation Denver N/A
303-400-XXXX --- 303-499-XXXX
NPANXX Carrier1 Area Served2 Date3
303-400 Qwest Corporation Denver N/A
303-401 Qwest Corporation Denver N/A
303-402 Qwest Corporation Denver N/A
303-403 Qwest Corporation Denver N/A
303-404 Qwest Corporation Denver N/A
303-405 Qwest Corporation Denver N/A
303-406 Level 3 Communications Denver N/A
303-407 Onvoy Denver N/A
303-408 New Cingular Wireless PCS Denver N/A
303-409 Level 3 Communications Denver N/A
303-410 Qwest Corporation Denver N/A
303-412 Qwest Corporation Denver N/A
303-413 Qwest Corporation Denver N/A
303-414 Level 3 Communications Denver N/A
303-415 Qwest Corporation Denver N/A
303-416 Level 3 Communications Denver N/A
303-417 Qwest Corporation Denver N/A
303-418 Level 3 Communications Denver N/A
303-419 T-Mobile USA Denver N/A
303-420 Qwest Corporation Denver N/A
303-421 Qwest Corporation Denver N/A
303-422 Qwest Corporation Denver N/A
303-423 Qwest Corporation Denver N/A
303-424 Qwest Corporation Denver N/A
303-425 Qwest Corporation Denver N/A
303-426 Qwest Corporation Denver N/A
303-427 Qwest Corporation Denver N/A
303-428 Qwest Corporation Denver N/A
303-429 Qwest Corporation Denver N/A
303-430 Qwest Corporation Denver N/A
303-431 Qwest Corporation Denver N/A
303-432 Qwest Corporation Denver N/A
303-433 Qwest Corporation Denver N/A
303-434 T-Mobile USA Denver N/A
303-435 T-Mobile USA Denver N/A
303-436 Qwest Corporation Denver N/A
303-437 T-Mobile USA Denver N/A
303-438 Qwest Corporation Denver N/A
303-439 Qwest Corporation Denver N/A
303-440 Qwest Corporation Denver N/A
303-441 Qwest Corporation Denver N/A
303-442 Qwest Corporation Denver N/A
303-443 Qwest Corporation Denver N/A
303-444 Qwest Corporation Denver N/A
303-445 Qwest Corporation Denver N/A
303-446 Qwest Corporation Denver N/A
303-447 Qwest Corporation Denver N/A
303-448 Qwest Corporation Denver N/A
303-449 Qwest Corporation Denver N/A
303-450 Qwest Corporation Denver N/A
303-451 Qwest Corporation Denver N/A
303-452 Qwest Corporation Denver N/A
303-453 Qwest Corporation Denver N/A
303-454 Qwest Corporation Denver N/A
303-455 Qwest Corporation Denver N/A
303-456 Qwest Corporation Denver N/A
303-457 Qwest Corporation Denver N/A
303-458 Qwest Corporation Denver N/A
303-459 Qwest Corporation Denver N/A
303-460 Qwest Corporation Denver N/A
303-461 USA Mobility Wireless Denver N/A
303-462 Qwest Corporation Denver N/A
303-463 Qwest Corporation Denver N/A
303-464 Qwest Corporation Denver N/A
303-465 Qwest Corporation Denver N/A
303-466 Qwest Corporation Denver N/A
303-467 Qwest Corporation Denver N/A
303-468 Onvoy Denver 5/24/2001
303-469 Qwest Corporation Denver N/A
303-470 Qwest Corporation Denver N/A
303-471 Qwest Corporation Denver N/A
303-472 T-Mobile USA Denver N/A
303-473 Qwest Corporation Denver N/A
303-474 Teleport Communications America Denver N/A
303-475 New Cingular Wireless PCS Denver N/A
303-476 MCIMetro Access Transmission Services Denver N/A
303-477 Qwest Corporation Denver N/A
303-478 New Cingular Wireless PCS Denver N/A
303-479 Teleport Communications America Denver N/A
303-480 Qwest Corporation Denver N/A
303-481 MCIMetro Access Transmission Services Denver N/A
303-482 Level 3 Communications Denver N/A
303-483 Level 3 Communications Denver N/A
303-484 Teleport Communications America Denver N/A
303-485 Qwest Corporation Longmont N/A
303-486 Qwest Corporation Denver N/A
303-487 Qwest Corporation Denver N/A
303-488 Qwest Corporation Denver N/A
303-489 Cellco Partnership Denver N/A
303-490 USA Mobility Wireless Denver N/A
303-491 Onvoy Spectrum Denver N/A
303-492 Qwest Corporation Denver N/A
303-493 Level 3 Communications Denver N/A
303-494 Qwest Corporation Denver N/A
303-495 MCIMetro Access Transmission Services Denver N/A
303-496 MCIMetro Access Transmission Services Denver 4/8/2004
303-497 Qwest Corporation Denver N/A
303-498 Comcast IP Phone Denver 4/22/2005
303-499 Qwest Corporation Denver N/A
303-500-XXXX --- 303-599-XXXX
NPANXX Carrier1 Area Served2 Date3
303-500 Level 3 Communications Hudson 1/4/2005
303-501 Cellco Partnership Denver 1/26/2006
303-502 Cellco Partnership Fort Lupton 12/13/2005
303-503 Cellco Partnership Denver N/A
303-504 Qwest Corporation Denver N/A
303-505 T-Mobile USA Denver 11/9/2012
303-506 New Cingular Wireless PCS Fort Lupton 9/13/2001
303-507 T-Mobile USA Denver N/A
303-508 American Messaging Services Denver N/A
303-509 American Messaging Services Denver N/A
303-510 American Messaging Services Denver N/A
303-512 Qwest Corporation Denver N/A
303-513 New Cingular Wireless PCS Denver 2/15/2002
303-514 Cellco Partnership Denver N/A
303-515 Onvoy Denver 11/14/2011
303-516 Qwest Corporation Denver N/A
303-517 New Cingular Wireless PCS Denver N/A
303-518 Cellco Partnership Denver N/A
303-519 Cellco Partnership Denver N/A
303-520 T-Mobile USA Denver N/A
303-521 T-Mobile USA Denver N/A
303-522 T-Mobile USA Denver N/A
303-523 T-Mobile USA Denver N/A
303-524 Teleport Communications America Denver N/A
303-525 T-Mobile USA Denver N/A
303-526 Qwest Corporation Denver N/A
303-527 Qwest Corporation Denver N/A
303-528 American Messaging Services Denver N/A
303-529 Onvoy Denver 10/7/2019
303-530 Qwest Corporation Denver N/A
303-531 MCIMetro Access Transmission Services Denver N/A
303-532 Paetec Itel Longmont N/A
303-533 Qwest Corporation Denver N/A
303-534 Qwest Corporation Denver N/A
303-535 Onvoy Fort Lupton N/A
303-536 Qwest Corporation Hudson N/A
303-537 Teleport Communications America Denver N/A
303-538 Qwest Corporation Denver N/A
303-539 MCIMetro Access Transmission Services Denver N/A
303-540 USA Mobility Wireless Denver N/A
303-541 Qwest Corporation Denver N/A
303-542 MCIMetro Access Transmission Services Denver N/A
303-543 Qwest Corporation Denver N/A
303-544 Qwest Corporation Denver N/A
303-545 Qwest Corporation Denver N/A
303-546 Qwest Corporation Denver N/A
303-547 Level 3 Communications Denver N/A
303-548 Cellco Partnership Denver N/A
303-549 Cellco Partnership Denver N/A
303-550 Cellco Partnership Denver N/A
303-551 MCIMetro Access Transmission Services Denver N/A
303-552 Level 3 Communications Denver N/A
303-553 USA Mobility Wireless Denver N/A
303-554 Qwest Corporation Denver N/A
303-556 Qwest Corporation Denver N/A
303-557 Level 3 Communications Denver N/A
303-558 Level 3 Communications Denver N/A
303-559 American Messaging Services Denver N/A
303-560 USA Mobility Wireless Denver N/A
303-561 Qwest Corporation Denver N/A
303-562 Level 3 Communications Denver N/A
303-563 Level 3 Communications Denver N/A
303-564 T-Mobile USA Denver N/A
303-565 Onvoy Denver N/A
303-566 MCIMetro Access Transmission Services Denver N/A
303-567 Qwest Corporation Denver N/A
303-568 Teleport Communications America Denver N/A
303-569 Qwest Corporation Georgetown N/A
303-570 New Cingular Wireless PCS Denver N/A
303-571 Qwest Corporation Denver N/A
303-572 Qwest Corporation Denver N/A
303-573 Qwest Corporation Denver N/A
303-574 Qwest Corporation Denver N/A
303-575 Qwest Corporation Denver N/A
303-576 Qwest Corporation Denver N/A
303-577 Electric Lightwave Denver N/A
303-578 Level 3 Communications Keenesburg 9/12/2006
303-579 Cellco Partnership Denver N/A
303-580 American Messaging Services Denver N/A
303-581 Qwest Corporation Denver N/A
303-582 Qwest Corporation Denver N/A
303-583 Teleport Communications America Denver N/A
303-584 Qwest Corporation Denver N/A
303-585 Qwest Corporation Denver N/A
303-586 Level 3 Communications Denver N/A
303-587 T-Mobile USA Denver N/A
303-588 New Cingular Wireless PCS Denver N/A
303-589 New Cingular Wireless PCS Denver N/A
303-590 Level 3 Communications Denver N/A
303-591 T-Mobile USA Denver N/A
303-592 Qwest Corporation Denver N/A
303-593 Teleport Communications America Denver N/A
303-594 Cellco Partnership Denver N/A
303-595 Qwest Corporation Denver N/A
303-596 T-Mobile USA Denver N/A
303-597 Electric Lightwave Denver N/A
303-598 T-Mobile USA Denver N/A
303-599 USA Mobility Wireless Denver N/A
303-600-XXXX --- 303-699-XXXX
NPANXX Carrier1 Area Served2 Date3
303-600 Teleport Communications America Denver N/A
303-601 New Cingular Wireless PCS Denver N/A
303-602 Qwest Corporation Denver N/A
303-603 Qwest Corporation Denver N/A
303-604 Qwest Corporation Denver N/A
303-605 Qwest Corporation Denver N/A
303-606 Qwest Corporation Denver N/A
303-607 Qwest Corporation Denver N/A
303-608 Qwest Corporation Denver N/A
303-609 USA Mobility Wireless Denver N/A
303-610 USA Mobility Wireless Denver N/A
303-612 USA Mobility Wireless Denver N/A
303-613 USA Mobility Wireless Denver N/A
303-614 Qwest Corporation Denver N/A
303-615 Qwest Corporation Denver N/A
303-616 Onvoy Spectrum Denver N/A
303-617 Qwest Corporation Denver N/A
303-618 New Cingular Wireless PCS Denver N/A
303-619 New Cingular Wireless PCS Denver N/A
303-620 Qwest Corporation Denver N/A
303-621 Qwest Corporation Denver N/A
303-622 Strasburg Tel. Co. Strasburg N/A
303-623 Qwest Corporation Denver N/A
303-624 Qwest Corporation Denver N/A
303-625 Level 3 Communications Denver N/A
303-626 Qwest Corporation Denver N/A
303-627 Qwest Corporation Denver N/A
303-628 Qwest Corporation Denver N/A
303-629 Qwest Corporation Denver N/A
303-630 Qwest Corporation Denver N/A
303-632 Teleport Communications America Denver N/A
303-633 Qwest Corporation Denver N/A
303-634 Qwest Corporation Denver N/A
303-635 Qwest Corporation Denver N/A
303-636 Qwest Corporation Denver N/A
303-637 Qwest Corporation Denver N/A
303-638 New Cingular Wireless PCS Denver N/A
303-639 Qwest Corporation Denver N/A
303-640 Qwest Corporation Denver N/A
303-641 T-Mobile USA Denver N/A
303-642 Qwest Corporation Denver N/A
303-643 Qwest Corporation Denver N/A
303-644 Eastern Slope Rural Tel. Assn. Bennett N/A
303-645 Qwest Corporation Denver N/A
303-646 Qwest Corporation Denver N/A
303-647 Qwest Corporation Deckers N/A
303-648 Qwest Corporation Denver N/A
303-649 Qwest Corporation Denver N/A
303-650 Qwest Corporation Denver N/A
303-651 Qwest Corporation Longmont N/A
303-652 Qwest Corporation Longmont N/A
303-653 Level 3 Communications Denver N/A
303-654 Qwest Corporation Denver N/A
303-655 Qwest Corporation Denver N/A
303-656 Cellco Partnership Denver N/A
303-657 Qwest Corporation Denver N/A
303-658 Qwest Corporation Denver N/A
303-659 Qwest Corporation Denver N/A
303-660 Qwest Corporation Denver N/A
303-661 Qwest Corporation Denver N/A
303-662 Qwest Corporation Denver N/A
303-663 Qwest Corporation Denver N/A
303-664 Qwest Corporation Denver N/A
303-665 Qwest Corporation Denver N/A
303-666 Qwest Corporation Denver N/A
303-667 T-Mobile USA Denver N/A
303-668 T-Mobile USA Denver N/A
303-669 T-Mobile USA Denver N/A
303-670 Qwest Corporation Denver N/A
303-671 Qwest Corporation Denver N/A
303-672 Qwest Corporation Denver N/A
303-673 Qwest Corporation Denver N/A
303-674 Qwest Corporation Denver N/A
303-675 Qwest Corporation Denver N/A
303-676 Qwest Corporation Denver N/A
303-677 Qwest Corporation Denver N/A
303-678 Qwest Corporation Longmont N/A
303-679 Qwest Corporation Denver N/A
303-680 Qwest Corporation Denver N/A
303-681 Qwest Corporation Denver N/A
303-682 Qwest Corporation Longmont N/A
303-683 Qwest Corporation Denver N/A
303-684 Qwest Corporation Longmont N/A
303-685 Qwest Corporation Denver N/A
303-686 USA Mobility Wireless Denver N/A
303-687 USA Mobility Wireless Denver N/A
303-688 Qwest Corporation Denver N/A
303-689 Qwest Corporation Denver N/A
303-690 Qwest Corporation Denver N/A
303-691 Qwest Corporation Denver N/A
303-692 Qwest Corporation Denver N/A
303-693 Qwest Corporation Denver N/A
303-694 Qwest Corporation Denver N/A
303-695 Qwest Corporation Denver N/A
303-696 Qwest Corporation Denver N/A
303-697 Qwest Corporation Denver N/A
303-698 Qwest Corporation Denver N/A
303-699 Qwest Corporation Denver N/A
303-701-XXXX --- 303-799-XXXX
NPANXX Carrier1 Area Served2 Date3
303-701 Communications Unlimited Denver N/A
303-702 Qwest Corporation Longmont N/A
303-703 Qwest Corporation Denver N/A
303-704 MCIMetro Access Transmission Services Denver N/A
303-705 Qwest Corporation Denver N/A
303-706 Qwest Corporation Denver N/A
303-707 Qwest Corporation Denver N/A
303-708 Qwest Corporation Denver N/A
303-709 Cellco Partnership Longmont N/A
303-710 Cellco Partnership Fort Lupton N/A
303-712 Qwest Corporation Denver N/A
303-713 Qwest Corporation Denver N/A
303-714 Qwest Corporation Denver N/A
303-715 Qwest Corporation Denver N/A
303-716 Qwest Corporation Denver N/A
303-717 New Cingular Wireless PCS Fort Lupton N/A
303-718 Cellco Partnership Fort Lupton N/A
303-719 Level 3 Communications Deer Trail 11/16/2006
303-720 Cellco Partnership Fort Lupton 6/13/2008
303-721 Qwest Corporation Denver N/A
303-722 Qwest Corporation Denver N/A
303-723 Teleport Communications America Denver N/A
303-724 Qwest Corporation Denver N/A
303-725 T-Mobile USA Denver N/A
303-726 Cellco Partnership Denver N/A
303-727 Qwest Corporation Denver N/A
303-728 Teleport Communications America Denver N/A
303-729 MCIMetro Access Transmission Services Denver N/A
303-730 Qwest Corporation Denver N/A
303-731 Level 3 Communications Denver N/A
303-732 Qwest Corporation Keenesburg N/A
303-733 Qwest Corporation Denver N/A
303-734 Qwest Corporation Denver N/A
303-735 Qwest Corporation Denver N/A
303-736 Teleport Communications America Denver N/A
303-737 Qwest Corporation Denver N/A
303-738 Qwest Corporation Denver N/A
303-739 Qwest Corporation Denver N/A
303-740 Qwest Corporation Denver N/A
303-741 Qwest Corporation Denver N/A
303-742 Qwest Corporation Denver N/A
303-743 Qwest Corporation Denver N/A
303-744 Qwest Corporation Denver N/A
303-745 Qwest Corporation Denver N/A
303-746 Cellco Partnership Longmont N/A
303-747 Qwest Corporation Allenspark-Lyons N/A
303-748 New Cingular Wireless PCS Denver N/A
303-749 Teleport Communications America Denver N/A
303-750 Qwest Corporation Denver N/A
303-751 Qwest Corporation Denver N/A
303-752 Qwest Corporation Denver N/A
303-753 Qwest Corporation Denver N/A
303-754 Qwest Corporation Denver N/A
303-755 Qwest Corporation Denver N/A
303-756 Qwest Corporation Denver N/A
303-757 Qwest Corporation Denver N/A
303-758 Qwest Corporation Denver N/A
303-759 Qwest Corporation Denver N/A
303-760 USA Mobility Wireless Denver N/A
303-761 Qwest Corporation Denver N/A
303-762 Qwest Corporation Denver N/A
303-763 Qwest Corporation Denver N/A
303-764 Qwest Corporation Denver N/A
303-765 Qwest Corporation Denver N/A
303-766 Qwest Corporation Denver N/A
303-767 American Messaging Services Denver N/A
303-768 Qwest Corporation Denver N/A
303-769 Bijou Tel. Coop. Assn. Deer Trail N/A
303-770 Qwest Corporation Denver N/A
303-771 Qwest Corporation Denver N/A
303-772 Qwest Corporation Longmont N/A
303-773 Qwest Corporation Denver N/A
303-774 Qwest Corporation Longmont N/A
303-775 Cellco Partnership Longmont N/A
303-776 Qwest Corporation Longmont N/A
303-777 Qwest Corporation Denver N/A
303-778 Qwest Corporation Denver N/A
303-779 Qwest Corporation Denver N/A
303-780 Qwest Corporation Denver N/A
303-781 Qwest Corporation Denver N/A
303-782 Qwest Corporation Denver N/A
303-783 Qwest Corporation Denver N/A
303-784 Qwest Corporation Denver N/A
303-785 MCIMetro Access Transmission Services Denver N/A
303-786 Qwest Corporation Denver N/A
303-787 Qwest Corporation Denver N/A
303-788 Qwest Corporation Denver N/A
303-789 Qwest Corporation Denver N/A
303-790 Qwest Corporation Denver N/A
303-791 Qwest Corporation Denver N/A
303-792 Qwest Corporation Denver N/A
303-793 Qwest Corporation Denver N/A
303-794 Qwest Corporation Denver N/A
303-795 Qwest Corporation Denver N/A
303-796 Qwest Corporation Denver N/A
303-797 Qwest Corporation Denver N/A
303-798 Qwest Corporation Denver N/A
303-799 Qwest Corporation Denver N/A
303-800-XXXX --- 303-899-XXXX
NPANXX Carrier1 Area Served2 Date3
303-800 Level 3 Communications Denver N/A
303-801 MCIMetro Access Transmission Services Denver N/A
303-802 Level 3 Telecom Of Colorado Denver N/A
303-803 Level 3 Telecom Of Colorado Denver N/A
303-804 Qwest Corporation Denver N/A
303-805 Qwest Corporation Denver N/A
303-806 Qwest Corporation Denver N/A
303-807 New Cingular Wireless PCS Denver N/A
303-808 New Cingular Wireless PCS Denver N/A
303-809 New Cingular Wireless PCS Denver N/A
303-810 New Cingular Wireless PCS Denver N/A
303-812 Qwest Corporation Denver N/A
303-813 Qwest Corporation Denver N/A
303-814 Qwest Corporation Denver N/A
303-815 Interlink Adv Svc Denver 2/3/2005
303-816 Qwest Corporation Deckers N/A
303-817 Cellco Partnership Denver N/A
303-818 Cellco Partnership Denver N/A
303-819 Cellco Partnership Denver N/A
303-820 Qwest Corporation Denver N/A
303-821 USA Mobility Wireless Denver N/A
303-822 Bijou Tel. Coop. Assn. Byers N/A
303-823 Qwest Corporation Allenspark-Lyons N/A
303-824 Teleport Communications America Denver N/A
303-825 Qwest Corporation Denver N/A
303-826 USA Mobility Wireless Denver N/A
303-827 Level 3 Communications Longmont N/A
303-828 Qwest Corporation Denver N/A
303-829 Cellco Partnership Denver N/A
303-830 Qwest Corporation Denver N/A
303-831 Qwest Corporation Denver N/A
303-832 Qwest Corporation Denver N/A
303-833 Qwest Corporation Denver N/A
303-834 Cellco Partnership Longmont 9/27/2006
303-835 Level 3 Communications Denver N/A
303-836 Communications Unlimited Denver N/A
303-837 Qwest Corporation Denver N/A
303-838 Qwest Corporation Deckers N/A
303-839 Qwest Corporation Denver N/A
303-840 Qwest Corporation Denver N/A
303-841 Qwest Corporation Denver N/A
303-842 Cellco Partnership Denver N/A
303-843 Qwest Corporation Denver N/A
303-844 Qwest Corporation Denver N/A
303-845 Teleport Communications America Longmont N/A
303-846 Qwest Corporation Denver N/A
303-847 Level 3 Communications Denver N/A
303-848 Level 3 Communications Longmont N/A
303-849 Roggen Tel. Coop. Co. Roggen N/A
303-850 Qwest Corporation Denver N/A
303-851 USA Mobility Wireless Denver N/A
303-852 USA Mobility Wireless Denver N/A
303-853 Qwest Corporation Denver N/A
303-854 Level 3 Communications Denver N/A
303-855 USA Mobility Wireless Denver N/A
303-856 Level 3 Communications Denver N/A
303-857 Qwest Corporation Fort Lupton N/A
303-858 Qwest Corporation Denver N/A
303-859 Cellco Partnership Denver N/A
303-860 Qwest Corporation Denver N/A
303-861 Qwest Corporation Denver N/A
303-862 Comcast IP Phone Denver 6/4/2005
303-863 Qwest Corporation Denver N/A
303-864 Qwest Corporation Denver N/A
303-865 Level 3 Communications Denver N/A
303-866 Qwest Corporation Denver N/A
303-867 Iloka Denver 11/4/2005
303-868 Cellco Partnership Denver N/A
303-869 Qwest Corporation Denver N/A
303-870 Cellco Partnership Denver N/A
303-871 Qwest Corporation Denver N/A
303-872 Level 3 Communications Denver N/A
303-873 Qwest Corporation Denver N/A
303-874 Level 3 Communications Denver N/A
303-875 T-Mobile USA Denver N/A
303-876 MCIMetro Access Transmission Services Denver N/A
303-877 Cellco Partnership Denver N/A
303-878 USA Mobility Wireless Denver N/A
303-879 Onvoy Denver N/A
303-880 Cellco Partnership Denver N/A
303-881 New Cingular Wireless PCS Denver N/A
303-882 New Cingular Wireless PCS Denver N/A
303-883 New Cingular Wireless PCS Denver N/A
303-884 New Cingular Wireless PCS Denver N/A
303-885 New Cingular Wireless PCS Denver 4/12/2001
303-886 New Cingular Wireless PCS Denver 4/12/2001
303-887 New Cingular Wireless PCS Denver 4/12/2001
303-888 New Cingular Wireless PCS Denver N/A
303-889 Qwest Corporation Denver N/A
303-890 USA Mobility Wireless Denver N/A
303-891 USA Mobility Wireless Denver N/A
303-892 Qwest Corporation Denver N/A
303-893 Qwest Corporation Denver N/A
303-894 Qwest Corporation Denver N/A
303-895 Cellco Partnership Denver N/A
303-896 Qwest Corporation Denver N/A
303-897 USA Mobility Wireless Denver N/A
303-898 New Cingular Wireless PCS Denver N/A
303-899 Qwest Corporation Denver N/A
303-900-XXXX --- 303-999-XXXX
NPANXX Carrier1 Area Served2 Date3
303-900 Level 3 Communications Georgetown 1/10/2007
303-901 T-Mobile USA Denver N/A
303-902 Cellco Partnership Denver N/A
303-903 Cellco Partnership Denver N/A
303-904 Qwest Corporation Denver N/A
303-905 Cellco Partnership Denver N/A
303-906 Cellco Partnership Denver N/A
303-907 Cellco Partnership Denver N/A
303-908 Cellco Partnership Denver N/A
303-909 Cellco Partnership Denver N/A
303-910 Cellco Partnership Denver N/A
303-912 Cellco Partnership Denver N/A
303-913 Cellco Partnership Denver N/A
303-914 Qwest Corporation Denver N/A
303-915 Cellco Partnership Denver N/A
303-916 Cellco Partnership Denver N/A
303-917 Cellco Partnership Denver N/A
303-918 Cellco Partnership Denver N/A
303-919 Cellco Partnership Denver N/A
303-920 Qwest Corporation Denver N/A
303-921 Cellco Partnership Denver N/A
303-922 Qwest Corporation Denver N/A
303-923 Level 3 Communications Denver N/A
303-924 Qwest Corporation Denver N/A
303-925 Qwest Corporation Denver N/A
303-926 Qwest Corporation Denver N/A
303-927 Teleport Communications America Denver N/A
303-928 MCIMetro Access Transmission Services Denver N/A
303-929 Cellco Partnership Denver N/A
303-930 Qwest Corporation Denver N/A
303-931 T-Mobile USA Denver N/A
303-932 Qwest Corporation Denver N/A
303-933 Qwest Corporation Denver N/A
303-934 Qwest Corporation Denver N/A
303-935 Qwest Corporation Denver N/A
303-936 Qwest Corporation Denver N/A
303-937 Qwest Corporation Denver N/A
303-938 Qwest Corporation Denver N/A
303-939 Qwest Corporation Denver N/A
303-940 Qwest Corporation Denver N/A
303-941 Cellco Partnership Denver N/A
303-942 Teleport Communications America Denver N/A
303-943 Skye Telecom Denver 9/9/2021
303-944 T-Mobile USA Denver N/A
303-945 Comcast IP Phone Denver N/A
303-946 T-Mobile USA Denver N/A
303-947 Cellco Partnership Denver N/A
303-948 Qwest Corporation Denver N/A
303-949 T-Mobile USA Denver N/A
303-951 Level 3 Communications Denver N/A
303-952 Level 3 Communications Denver N/A
303-953 Level 3 Communications Denver N/A
303-954 Level 3 Communications Denver N/A
303-955 Level 3 Communications Denver N/A
303-956 New Cingular Wireless PCS Fort Lupton N/A
303-957 Level 3 Communications Denver N/A
303-960 T-Mobile USA Denver N/A
303-961 T-Mobile USA Denver N/A
303-962 Onvoy Denver 7/14/2005
303-963 Level 3 Communications Denver N/A
303-964 Qwest Corporation Denver N/A
303-965 Qwest Corporation Denver N/A
303-966 Qwest Corporation Denver N/A
303-967 Qwest Corporation Denver N/A
303-968 MCIMetro Access Transmission Services Denver N/A
303-969 Qwest Corporation Denver N/A
303-970 Onvoy Deckers 3/31/2022
303-971 Qwest Corporation Denver N/A
303-972 Qwest Corporation Denver N/A
303-973 Qwest Corporation Denver N/A
303-974 Level 3 Communications Denver N/A
303-975 Qwest Corporation Denver N/A
303-977 Qwest Corporation Denver N/A
303-978 Qwest Corporation Denver N/A
303-979 Qwest Corporation Denver N/A
303-980 Qwest Corporation Denver N/A
303-981 Cellco Partnership Denver N/A
303-982 Qwest Corporation Denver N/A
303-984 Qwest Corporation Denver N/A
303-985 Qwest Corporation Denver N/A
303-986 Qwest Corporation Denver N/A
303-987 Qwest Corporation Denver N/A
303-988 Qwest Corporation Denver N/A
303-989 Qwest Corporation Denver N/A
303-990 T-Mobile USA Fort Lupton 5/16/2006
303-991 MCIMetro Access Transmission Services Denver N/A
303-992 Qwest Corporation Denver N/A
303-993 Onvoy Denver 3/27/2007
303-994 T-Mobile USA Denver N/A
303-995 T-Mobile USA Denver N/A
303-996 Electric Lightwave Denver N/A
303-997 Comcast IP Phone Denver N/A
303-998 Qwest Corporation Denver N/A
303-999 Comcast IP Phone Denver 8/24/2007
  1. NPA-NXX assigned carrier; with Number Pooling thousand block numbers are often assigned to other carriers as well; moreover, phone numbers can be ported between service providers
  2. For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
  3. Assignment date. N/A - mostly central office codes assigned before 2001.
  4. NXX prefixes last updated: November 22, 2025

Cities in area code 303

City1 County Time Zone1
Allenspark Boulder M
Arvada Jefferson M
Aurora Adams M
Bailey Park M
Bennett Adams M
Black Hawk Gilpin M
Bond Eagle M
Boulder Boulder M
Brighton Adams M
Broomfield Broomfield M
Buffalo Creek Jefferson M
Byers Arapahoe M
Castle Rock Douglas M
Central City Gilpin M
Commerce City Adams M
Conifer Jefferson M
Dacono Weld M
Deer Trail Arapahoe M
Denver Adams M
Dumont Clear Creek M
Dupont Adams M
Eastlake Adams M
Elbert El Paso M
Eldorado Springs Boulder M
Elizabeth Elbert M
Empire Clear Creek M
Englewood Arapahoe M
Erie Weld M
Evergreen Jefferson M
Firestone Weld M
Fort Lupton Weld M
Franktown Douglas M
Frederick Weld M
Georgetown Clear Creek M
Golden Jefferson M
Grant Park M
Henderson Adams M
Hereford Weld M
Highlands Ranch Douglas M
Hudson Weld M
Hygiene Boulder M
Idaho Springs Clear Creek M
Idledale Jefferson M
Indian Hills Jefferson M
Jamestown Boulder M
Keenesburg Weld M
Kiowa Elbert M
Kittredge Jefferson M
Lafayette Boulder M
Lakewood Jefferson M
Larkspur Douglas M
Littleton Arapahoe M
Longmont Boulder M
Louisville Boulder M
Louviers Douglas M
Lyons Boulder M
Morrison Jefferson M
Nederland Boulder M
Niwot Boulder M
Parker Douglas M
Pine Jefferson M
Pinecliffe Boulder M
Roggen Weld M
Rollinsville Gilpin M
Sedalia Douglas M
Sedgwick Sedgwick M
Shawnee Park M
Silver Plume Clear Creek M
Strasburg Adams M
Thornton Adams M
Ward Boulder M
Watkins Adams M
Westminster Adams M
Wheat Ridge Jefferson M
  1. Listed above are most places served by USA area code 303. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
  2. M stands for Mountain Time (currently ).
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