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

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Area Code 303

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 Area served[1] Provider[2] Date[3]
303-200 Denver Multiple N/A
303-201 Denver USA Mobility Wireless N/A
303-202 Denver Qwest Corporation N/A
303-203 Denver American Messaging Services N/A
303-204 Denver Cellco Partnership N/A
303-205 Denver Qwest Corporation N/A
303-206 Denver USA Mobility Wireless N/A
303-207 Denver USA Mobility Wireless N/A
303-208 Denver USA Mobility Wireless N/A
303-209 Denver MCIMetro Access Transmission Services N/A
303-210 Denver T-Mobile USA N/A
303-212 Denver American Messaging Services N/A
303-213 Denver USA Mobility Wireless N/A
303-214 Denver Multiple N/A
303-215 Denver Qwest Corporation N/A
303-216 Denver Qwest Corporation N/A
303-217 Denver Multiple N/A
303-218 Denver Multiple N/A
303-219 Denver Multiple N/A
303-220 Denver Qwest Corporation N/A
303-221 Denver Qwest Corporation N/A
303-222 Denver MCIMetro Access Transmission Services N/A
303-223 Denver Level 3 Communications N/A
303-224 Denver Qwest Corporation N/A
303-225 Denver Multiple N/A
303-226 Denver Level 3 Communications N/A
303-227 Denver Qwest Corporation N/A
303-228 Denver Level 3 Communications N/A
303-229 Denver Cellco Partnership N/A
303-230 Denver USA Mobility Wireless N/A
303-231 Denver Qwest Corporation N/A
303-232 Denver Qwest Corporation N/A
303-233 Denver Qwest Corporation N/A
303-234 Denver Qwest Corporation N/A
303-235 Denver Qwest Corporation N/A
303-236 Denver Qwest Corporation N/A
303-237 Denver Qwest Corporation N/A
303-238 Denver Qwest Corporation N/A
303-239 Denver Qwest Corporation N/A
303-240 Denver USA Mobility Wireless N/A
303-241 Denver Cellco Partnership N/A
303-242 Denver Multiple N/A
303-243 Denver Multiple N/A
303-244 Denver Qwest Corporation N/A
303-245 Denver Qwest Corporation N/A
303-246 Denver T-Mobile USA N/A
303-247 Denver Qwest Corporation N/A
303-248 Denver Multiple N/A
303-249 Denver New Cingular Wireless PCS N/A
303-250 Denver New Cingular Wireless PCS N/A
303-251 Denver USA Mobility Wireless N/A
303-252 Denver Qwest Corporation N/A
303-253 Denver Multiple N/A
303-254 Denver Qwest Corporation N/A
303-255 Denver Qwest Corporation N/A
303-256 Denver Teleport Communications America N/A
303-257 Denver T-Mobile USA N/A
303-258 Denver Multiple N/A
303-259 Denver American Messaging Services N/A
303-260 Denver Multiple N/A
303-261 Denver Multiple N/A
303-262 Denver Teleport Communications America N/A
303-263 Denver Cellco Partnership N/A
303-264 Denver Multiple N/A
303-265 Denver Multiple N/A
303-266 Denver USA Mobility Wireless N/A
303-267 Denver Qwest Corporation N/A
303-268 Denver Level 3 Communications N/A
303-269 Denver Multiple N/A
303-270 Denver Qwest Corporation N/A
303-271 Denver Qwest Corporation N/A
303-272 Denver Qwest Corporation N/A
303-273 Denver Qwest Corporation N/A
303-274 Denver Qwest Corporation N/A
303-275 Denver Qwest Corporation N/A
303-276 Denver Onvoy 8/19/2021
303-277 Denver Qwest Corporation N/A
303-278 Denver Qwest Corporation N/A
303-279 Denver Qwest Corporation N/A
303-280 Denver Qwest Corporation N/A
303-281 Denver Qwest Corporation N/A
303-282 Denver Qwest Corporation N/A
303-283 Denver Qwest Corporation N/A
303-284 Denver Comcast IP Phone N/A
303-285 Denver Level 3 Communications N/A
303-286 Denver Qwest Corporation N/A
303-287 Denver Qwest Corporation N/A
303-288 Denver Qwest Corporation N/A
303-289 Denver Qwest Corporation N/A
303-290 Denver Qwest Corporation N/A
303-291 Denver Qwest Corporation N/A
303-292 Denver Qwest Corporation N/A
303-293 Denver Qwest Corporation N/A
303-294 Denver Qwest Corporation N/A
303-295 Denver Qwest Corporation N/A
303-296 Denver Qwest Corporation N/A
303-297 Denver Qwest Corporation N/A
303-298 Denver Qwest Corporation N/A
303-299 Denver Qwest Corporation N/A
303-300-XXXX --- 303-399-XXXX
NPANXX Area served[1] Provider[2] Date[3]
303-300 Denver Qwest Corporation N/A
303-301 Denver Multiple N/A
303-302 Denver MCIMetro Access Transmission Services N/A
303-303 Denver HD Carrier 08/26/2024
303-304 Fort Lupton Multiple 11/18/2004
303-305 Denver Multiple N/A
303-306 Denver Multiple N/A
303-307 Denver Qwest Corporation N/A
303-308 Denver Qwest Corporation N/A
303-309 Denver Multiple N/A
303-310 Denver American Messaging Services N/A
303-312 Denver Qwest Corporation N/A
303-313 Denver Qwest Corporation N/A
303-314 Denver Multiple N/A
303-315 Denver Qwest Corporation N/A
303-316 Denver Multiple N/A
303-317 Denver Multiple N/A
303-318 Denver Qwest Corporation N/A
303-319 Denver Multiple 8/12/2004
303-320 Denver Qwest Corporation N/A
303-321 Denver Qwest Corporation N/A
303-322 Denver Qwest Corporation N/A
303-323 Denver Multiple N/A
303-324 Denver New Cingular Wireless PCS N/A
303-325 Denver Multiple N/A
303-326 Denver Qwest Corporation N/A
303-327 Denver Multiple N/A
303-328 Denver Multiple N/A
303-329 Denver Qwest Corporation N/A
303-330 Denver Multiple 3/9/2006
303-331 Denver Qwest Corporation N/A
303-332 Denver T-Mobile USA N/A
303-333 Denver Qwest Corporation N/A
303-334 Denver MCIMetro Access Transmission Services N/A
303-335 Denver Multiple N/A
303-336 Denver Qwest Corporation N/A
303-337 Denver Qwest Corporation N/A
303-338 Denver Qwest Corporation N/A
303-339 Denver Multiple 12/15/2003
303-340 Denver Qwest Corporation N/A
303-341 Denver Qwest Corporation N/A
303-342 Denver Qwest Corporation N/A
303-343 Denver Qwest Corporation N/A
303-344 Denver Qwest Corporation N/A
303-345 Denver Multiple N/A
303-346 Denver Qwest Corporation N/A
303-347 Denver Qwest Corporation N/A
303-348 Denver Multiple N/A
303-349 Denver Cellco Partnership N/A
303-350 Denver Multiple N/A
303-351 Deckers Multiple 11/8/2006
303-352 Denver Qwest Corporation N/A
303-353 Denver Multiple N/A
303-354 Denver Teleport Communications America N/A
303-355 Denver Qwest Corporation N/A
303-356 Denver T-Mobile USA N/A
303-357 Denver Multiple N/A
303-358 Denver Cellco Partnership N/A
303-359 Denver T-Mobile USA N/A
303-360 Denver Qwest Corporation N/A
303-361 Denver Qwest Corporation N/A
303-362 Denver Multiple N/A
303-363 Denver Qwest Corporation N/A
303-364 Denver Qwest Corporation N/A
303-365 Denver Qwest Corporation N/A
303-366 Denver Qwest Corporation N/A
303-367 Denver Qwest Corporation N/A
303-368 Denver Qwest Corporation N/A
303-369 Denver Qwest Corporation N/A
303-370 Denver Qwest Corporation N/A
303-371 Denver Qwest Corporation N/A
303-372 Denver Qwest Corporation N/A
303-373 Denver Qwest Corporation N/A
303-374 Denver Multiple N/A
303-375 Denver Qwest Corporation N/A
303-376 Denver Level 3 Communications N/A
303-377 Denver Qwest Corporation N/A
303-378 Denver New Cingular Wireless PCS N/A
303-379 Denver Multiple N/A
303-380 Denver Qwest Corporation N/A
303-381 Denver Level 3 Communications N/A
303-382 Denver Qwest Corporation N/A
303-383 Denver Qwest Corporation N/A
303-384 Denver Qwest Corporation N/A
303-385 Denver Multiple N/A
303-386 Denver Multiple N/A
303-387 Denver Qwest Corporation N/A
303-388 Denver Qwest Corporation N/A
303-389 Denver Multiple N/A
303-390 Denver MCIMetro Access Transmission Services N/A
303-391 Denver Qwest Corporation N/A
303-392 Denver Cellco Partnership 01/16/2025
303-393 Denver Qwest Corporation N/A
303-394 Denver Qwest Corporation N/A
303-395 Denver Level 3 Communications N/A
303-396 Denver Multiple 6/1/2005
303-397 Denver Qwest Corporation N/A
303-398 Denver Qwest Corporation N/A
303-399 Denver Qwest Corporation N/A
303-400-XXXX --- 303-499-XXXX
NPANXX Area served[1] Provider[2] Date[3]
303-400 Denver Qwest Corporation N/A
303-401 Denver Multiple N/A
303-402 Denver Qwest Corporation N/A
303-403 Denver Qwest Corporation N/A
303-404 Denver Qwest Corporation N/A
303-405 Denver Qwest Corporation N/A
303-406 Denver Multiple N/A
303-407 Denver Onvoy N/A
303-408 Denver New Cingular Wireless PCS N/A
303-409 Denver Multiple N/A
303-410 Denver Qwest Corporation N/A
303-412 Denver Qwest Corporation N/A
303-413 Denver Qwest Corporation N/A
303-414 Denver Multiple N/A
303-415 Denver Qwest Corporation N/A
303-416 Denver Multiple N/A
303-417 Denver Qwest Corporation N/A
303-418 Denver Multiple N/A
303-419 Denver T-Mobile USA N/A
303-420 Denver Qwest Corporation N/A
303-421 Denver Qwest Corporation N/A
303-422 Denver Qwest Corporation N/A
303-423 Denver Qwest Corporation N/A
303-424 Denver Qwest Corporation N/A
303-425 Denver Qwest Corporation N/A
303-426 Denver Qwest Corporation N/A
303-427 Denver Qwest Corporation N/A
303-428 Denver Qwest Corporation N/A
303-429 Denver Qwest Corporation N/A
303-430 Denver Qwest Corporation N/A
303-431 Denver Qwest Corporation N/A
303-432 Denver Qwest Corporation N/A
303-433 Denver Qwest Corporation N/A
303-434 Denver T-Mobile USA N/A
303-435 Denver T-Mobile USA N/A
303-436 Denver Qwest Corporation N/A
303-437 Denver T-Mobile USA N/A
303-438 Denver Qwest Corporation N/A
303-439 Denver Qwest Corporation N/A
303-440 Denver Qwest Corporation N/A
303-441 Denver Qwest Corporation N/A
303-442 Denver Qwest Corporation N/A
303-443 Denver Qwest Corporation N/A
303-444 Denver Qwest Corporation N/A
303-445 Denver Qwest Corporation N/A
303-446 Denver Qwest Corporation N/A
303-447 Denver Qwest Corporation N/A
303-448 Denver Qwest Corporation N/A
303-449 Denver Qwest Corporation N/A
303-450 Denver Qwest Corporation N/A
303-451 Denver Qwest Corporation N/A
303-452 Denver Qwest Corporation N/A
303-453 Denver Multiple N/A
303-454 Denver Qwest Corporation N/A
303-455 Denver Qwest Corporation N/A
303-456 Denver Qwest Corporation N/A
303-457 Denver Multiple N/A
303-458 Denver Qwest Corporation N/A
303-459 Denver Multiple N/A
303-460 Denver Qwest Corporation N/A
303-461 Denver USA Mobility Wireless N/A
303-462 Denver Qwest Corporation N/A
303-463 Denver Qwest Corporation N/A
303-464 Denver Qwest Corporation N/A
303-465 Denver Qwest Corporation N/A
303-466 Denver Qwest Corporation N/A
303-467 Denver Qwest Corporation N/A
303-468 Denver Onvoy 5/24/2001
303-469 Denver Qwest Corporation N/A
303-470 Denver Qwest Corporation N/A
303-471 Denver Qwest Corporation N/A
303-472 Denver T-Mobile USA N/A
303-473 Denver Qwest Corporation N/A
303-474 Denver Multiple N/A
303-475 Denver New Cingular Wireless PCS N/A
303-476 Denver Multiple N/A
303-477 Denver Qwest Corporation N/A
303-478 Denver New Cingular Wireless PCS N/A
303-479 Denver Multiple N/A
303-480 Denver Qwest Corporation N/A
303-481 Denver Multiple N/A
303-482 Denver Multiple N/A
303-483 Denver Multiple N/A
303-484 Denver Multiple N/A
303-485 Longmont Qwest Corporation N/A
303-486 Denver Qwest Corporation N/A
303-487 Denver Qwest Corporation N/A
303-488 Denver Qwest Corporation N/A
303-489 Denver Cellco Partnership N/A
303-490 Denver USA Mobility Wireless N/A
303-491 Denver Onvoy Spectrum N/A
303-492 Denver Qwest Corporation N/A
303-493 Denver Multiple N/A
303-494 Denver Qwest Corporation N/A
303-495 Denver Multiple N/A
303-496 Denver MCIMetro Access Transmission Services 4/8/2004
303-497 Denver Qwest Corporation N/A
303-498 Denver Multiple 4/22/2005
303-499 Denver Qwest Corporation N/A
303-500-XXXX --- 303-599-XXXX
NPANXX Area served[1] Provider[2] Date[3]
303-500 Hudson Multiple 1/4/2005
303-501 Denver Multiple 1/26/2006
303-502 Fort Lupton Multiple 12/13/2005
303-503 Denver Cellco Partnership N/A
303-504 Denver Qwest Corporation N/A
303-505 Denver T-Mobile USA 11/9/2012
303-506 Fort Lupton New Cingular Wireless PCS 9/13/2001
303-507 Denver T-Mobile USA N/A
303-508 Denver American Messaging Services N/A
303-509 Denver American Messaging Services N/A
303-510 Denver American Messaging Services N/A
303-512 Denver Multiple N/A
303-513 Denver New Cingular Wireless PCS 2/15/2002
303-514 Denver Cellco Partnership N/A
303-515 Denver Multiple 11/14/2011
303-516 Denver Qwest Corporation N/A
303-517 Denver New Cingular Wireless PCS N/A
303-518 Denver Cellco Partnership N/A
303-519 Denver Cellco Partnership N/A
303-520 Denver T-Mobile USA N/A
303-521 Denver T-Mobile USA N/A
303-522 Denver T-Mobile USA N/A
303-523 Denver T-Mobile USA N/A
303-524 Denver Multiple N/A
303-525 Denver T-Mobile USA N/A
303-526 Denver Multiple N/A
303-527 Denver Qwest Corporation N/A
303-528 Denver American Messaging Services N/A
303-529 Denver Onvoy 10/7/2019
303-530 Denver Qwest Corporation N/A
303-531 Denver Multiple N/A
303-532 Longmont Multiple N/A
303-533 Denver Qwest Corporation N/A
303-534 Denver Qwest Corporation N/A
303-535 Fort Lupton Onvoy N/A
303-536 Hudson Multiple N/A
303-537 Denver Multiple N/A
303-538 Denver Qwest Corporation N/A
303-539 Denver MCIMetro Access Transmission Services N/A
303-540 Denver USA Mobility Wireless N/A
303-541 Denver Qwest Corporation N/A
303-542 Denver MCIMetro Access Transmission Services N/A
303-543 Denver Qwest Corporation N/A
303-544 Denver Qwest Corporation N/A
303-545 Denver Qwest Corporation N/A
303-546 Denver Qwest Corporation N/A
303-547 Denver Multiple N/A
303-548 Denver Cellco Partnership N/A
303-549 Denver Cellco Partnership N/A
303-550 Denver Cellco Partnership N/A
303-551 Denver Multiple N/A
303-552 Denver Multiple N/A
303-553 Denver USA Mobility Wireless N/A
303-554 Denver Qwest Corporation N/A
303-556 Denver Qwest Corporation N/A
303-557 Denver Multiple N/A
303-558 Denver Multiple N/A
303-559 Denver American Messaging Services N/A
303-560 Denver USA Mobility Wireless N/A
303-561 Denver Qwest Corporation N/A
303-562 Denver Multiple N/A
303-563 Denver Multiple N/A
303-564 Denver T-Mobile USA N/A
303-565 Denver Multiple N/A
303-566 Denver Multiple N/A
303-567 Denver Multiple N/A
303-568 Denver Multiple N/A
303-569 Georgetown Multiple N/A
303-570 Denver New Cingular Wireless PCS N/A
303-571 Denver Qwest Corporation N/A
303-572 Denver Qwest Corporation N/A
303-573 Denver Qwest Corporation N/A
303-574 Denver Qwest Corporation N/A
303-575 Denver Qwest Corporation N/A
303-576 Denver Qwest Corporation N/A
303-577 Denver Electric Lightwave N/A
303-578 Keenesburg Multiple 9/12/2006
303-579 Denver Cellco Partnership N/A
303-580 Denver American Messaging Services N/A
303-581 Denver Qwest Corporation N/A
303-582 Denver Multiple N/A
303-583 Denver Teleport Communications America N/A
303-584 Denver Qwest Corporation N/A
303-585 Denver Multiple N/A
303-586 Denver Multiple N/A
303-587 Denver T-Mobile USA N/A
303-588 Denver New Cingular Wireless PCS N/A
303-589 Denver New Cingular Wireless PCS N/A
303-590 Denver Multiple N/A
303-591 Denver T-Mobile USA N/A
303-592 Denver Qwest Corporation N/A
303-593 Denver Multiple N/A
303-594 Denver Cellco Partnership N/A
303-595 Denver Qwest Corporation N/A
303-596 Denver T-Mobile USA N/A
303-597 Denver Multiple N/A
303-598 Denver Multiple N/A
303-599 Denver USA Mobility Wireless N/A
303-600-XXXX --- 303-699-XXXX
NPANXX Area served[1] Provider[2] Date[3]
303-600 Denver Multiple N/A
303-601 Denver New Cingular Wireless PCS N/A
303-602 Denver Qwest Corporation N/A
303-603 Denver Qwest Corporation N/A
303-604 Denver Qwest Corporation N/A
303-605 Denver Qwest Corporation N/A
303-606 Denver Qwest Corporation N/A
303-607 Denver Multiple N/A
303-608 Denver Qwest Corporation N/A
303-609 Denver USA Mobility Wireless N/A
303-610 Denver USA Mobility Wireless N/A
303-612 Denver USA Mobility Wireless N/A
303-613 Denver USA Mobility Wireless N/A
303-614 Denver Qwest Corporation N/A
303-615 Denver Qwest Corporation N/A
303-616 Denver Onvoy Spectrum N/A
303-617 Denver Qwest Corporation N/A
303-618 Denver New Cingular Wireless PCS N/A
303-619 Denver New Cingular Wireless PCS N/A
303-620 Denver Multiple N/A
303-621 Denver Multiple N/A
303-622 Strasburg Multiple N/A
303-623 Denver Qwest Corporation N/A
303-624 Denver Qwest Corporation N/A
303-625 Denver Multiple N/A
303-626 Denver Qwest Corporation N/A
303-627 Denver Qwest Corporation N/A
303-628 Denver Qwest Corporation N/A
303-629 Denver Qwest Corporation N/A
303-630 Denver Multiple N/A
303-632 Denver Multiple N/A
303-633 Denver Qwest Corporation N/A
303-634 Denver Qwest Corporation N/A
303-635 Denver Multiple N/A
303-636 Denver Multiple N/A
303-637 Denver Qwest Corporation N/A
303-638 Denver New Cingular Wireless PCS N/A
303-639 Denver Qwest Corporation N/A
303-640 Denver Qwest Corporation N/A
303-641 Denver T-Mobile USA N/A
303-642 Denver Multiple N/A
303-643 Denver Multiple N/A
303-644 Bennett Eastern Slope Rural Tel. Assn. N/A
303-645 Denver Multiple N/A
303-646 Denver Multiple N/A
303-647 Deckers Multiple N/A
303-648 Denver Multiple N/A
303-649 Denver Qwest Corporation N/A
303-650 Denver Qwest Corporation N/A
303-651 Longmont Qwest Corporation N/A
303-652 Longmont Multiple N/A
303-653 Denver Multiple N/A
303-654 Denver Qwest Corporation N/A
303-655 Denver Qwest Corporation N/A
303-656 Denver Multiple N/A
303-657 Denver Qwest Corporation N/A
303-658 Denver Multiple N/A
303-659 Denver Qwest Corporation N/A
303-660 Denver Qwest Corporation N/A
303-661 Denver Multiple N/A
303-662 Denver Qwest Corporation N/A
303-663 Denver Qwest Corporation N/A
303-664 Denver Qwest Corporation N/A
303-665 Denver Qwest Corporation N/A
303-666 Denver Qwest Corporation N/A
303-667 Denver T-Mobile USA N/A
303-668 Denver T-Mobile USA N/A
303-669 Denver T-Mobile USA N/A
303-670 Denver Qwest Corporation N/A
303-671 Denver Qwest Corporation N/A
303-672 Denver Qwest Corporation N/A
303-673 Denver Qwest Corporation N/A
303-674 Denver Qwest Corporation N/A
303-675 Denver Qwest Corporation N/A
303-676 Denver Multiple N/A
303-677 Denver Qwest Corporation N/A
303-678 Longmont Qwest Corporation N/A
303-679 Denver Qwest Corporation N/A
303-680 Denver Qwest Corporation N/A
303-681 Denver Multiple N/A
303-682 Longmont Qwest Corporation N/A
303-683 Denver Qwest Corporation N/A
303-684 Longmont Qwest Corporation N/A
303-685 Denver Qwest Corporation N/A
303-686 Denver USA Mobility Wireless N/A
303-687 Denver USA Mobility Wireless N/A
303-688 Denver Qwest Corporation N/A
303-689 Denver Qwest Corporation N/A
303-690 Denver Qwest Corporation N/A
303-691 Denver Qwest Corporation N/A
303-692 Denver Qwest Corporation N/A
303-693 Denver Qwest Corporation N/A
303-694 Denver Qwest Corporation N/A
303-695 Denver Qwest Corporation N/A
303-696 Denver Qwest Corporation N/A
303-697 Denver Qwest Corporation N/A
303-698 Denver Qwest Corporation N/A
303-699 Denver Qwest Corporation N/A
303-701-XXXX --- 303-799-XXXX
NPANXX Area served[1] Provider[2] Date[3]
303-701 Denver Communications Unlimited N/A
303-702 Longmont Qwest Corporation N/A
303-703 Denver Qwest Corporation N/A
303-704 Denver Multiple N/A
303-705 Denver Qwest Corporation N/A
303-706 Denver Qwest Corporation N/A
303-707 Denver Qwest Corporation N/A
303-708 Denver Qwest Corporation N/A
303-709 Longmont Cellco Partnership N/A
303-710 Fort Lupton Multiple N/A
303-712 Denver Qwest Corporation N/A
303-713 Denver Qwest Corporation N/A
303-714 Denver Qwest Corporation N/A
303-715 Denver Multiple N/A
303-716 Denver Qwest Corporation N/A
303-717 Fort Lupton New Cingular Wireless PCS N/A
303-718 Fort Lupton Multiple N/A
303-719 Deer Trail Level 3 Communications 11/16/2006
303-720 Fort Lupton Multiple 6/13/2008
303-721 Denver Qwest Corporation N/A
303-722 Denver Qwest Corporation N/A
303-723 Denver Teleport Communications America N/A
303-724 Denver Qwest Corporation N/A
303-725 Denver Multiple N/A
303-726 Denver Cellco Partnership N/A
303-727 Denver Multiple N/A
303-728 Denver Multiple N/A
303-729 Denver MCIMetro Access Transmission Services N/A
303-730 Denver Qwest Corporation N/A
303-731 Denver Multiple N/A
303-732 Keenesburg Multiple N/A
303-733 Denver Qwest Corporation N/A
303-734 Denver Qwest Corporation N/A
303-735 Denver Qwest Corporation N/A
303-736 Denver Multiple N/A
303-737 Denver Qwest Corporation N/A
303-738 Denver Qwest Corporation N/A
303-739 Denver Qwest Corporation N/A
303-740 Denver Qwest Corporation N/A
303-741 Denver Qwest Corporation N/A
303-742 Denver Qwest Corporation N/A
303-743 Denver Qwest Corporation N/A
303-744 Denver Qwest Corporation N/A
303-745 Denver Qwest Corporation N/A
303-746 Longmont Cellco Partnership N/A
303-747 Allenspark-Lyons Multiple N/A
303-748 Denver New Cingular Wireless PCS N/A
303-749 Denver Multiple N/A
303-750 Denver Qwest Corporation N/A
303-751 Denver Qwest Corporation N/A
303-752 Denver Qwest Corporation N/A
303-753 Denver Qwest Corporation N/A
303-754 Denver Qwest Corporation N/A
303-755 Denver Qwest Corporation N/A
303-756 Denver Qwest Corporation N/A
303-757 Denver Qwest Corporation N/A
303-758 Denver Qwest Corporation N/A
303-759 Denver Qwest Corporation N/A
303-760 Denver USA Mobility Wireless N/A
303-761 Denver Qwest Corporation N/A
303-762 Denver Qwest Corporation N/A
303-763 Denver Multiple N/A
303-764 Denver Qwest Corporation N/A
303-765 Denver Qwest Corporation N/A
303-766 Denver Qwest Corporation N/A
303-767 Denver American Messaging Services N/A
303-768 Denver Qwest Corporation N/A
303-769 Deer Trail Bijou Tel. Coop. Assn. N/A
303-770 Denver Qwest Corporation N/A
303-771 Denver Qwest Corporation N/A
303-772 Longmont Qwest Corporation N/A
303-773 Denver Qwest Corporation N/A
303-774 Longmont Qwest Corporation N/A
303-775 Longmont Cellco Partnership N/A
303-776 Longmont Qwest Corporation N/A
303-777 Denver Qwest Corporation N/A
303-778 Denver Qwest Corporation N/A
303-779 Denver Qwest Corporation N/A
303-780 Denver Qwest Corporation N/A
303-781 Denver Qwest Corporation N/A
303-782 Denver Qwest Corporation N/A
303-783 Denver Qwest Corporation N/A
303-784 Denver Qwest Corporation N/A
303-785 Denver MCIMetro Access Transmission Services N/A
303-786 Denver Qwest Corporation N/A
303-787 Denver Qwest Corporation N/A
303-788 Denver Qwest Corporation N/A
303-789 Denver Qwest Corporation N/A
303-790 Denver Qwest Corporation N/A
303-791 Denver Qwest Corporation N/A
303-792 Denver Qwest Corporation N/A
303-793 Denver Qwest Corporation N/A
303-794 Denver Qwest Corporation N/A
303-795 Denver Qwest Corporation N/A
303-796 Denver Qwest Corporation N/A
303-797 Denver Qwest Corporation N/A
303-798 Denver Qwest Corporation N/A
303-799 Denver Qwest Corporation N/A
303-800-XXXX --- 303-899-XXXX
NPANXX Area served[1] Provider[2] Date[3]
303-800 Denver Level 3 Communications N/A
303-801 Denver Multiple N/A
303-802 Denver Multiple N/A
303-803 Denver Multiple N/A
303-804 Denver Qwest Corporation N/A
303-805 Denver Qwest Corporation N/A
303-806 Denver Qwest Corporation N/A
303-807 Denver New Cingular Wireless PCS N/A
303-808 Denver New Cingular Wireless PCS N/A
303-809 Denver New Cingular Wireless PCS N/A
303-810 Denver New Cingular Wireless PCS N/A
303-812 Denver Qwest Corporation N/A
303-813 Denver Qwest Corporation N/A
303-814 Denver Qwest Corporation N/A
303-815 Denver Multiple 2/3/2005
303-816 Deckers Multiple N/A
303-817 Denver Cellco Partnership N/A
303-818 Denver Cellco Partnership N/A
303-819 Denver Cellco Partnership N/A
303-820 Denver Qwest Corporation N/A
303-821 Denver USA Mobility Wireless N/A
303-822 Byers Bijou Tel. Coop. Assn. N/A
303-823 Allenspark-Lyons Multiple N/A
303-824 Denver Multiple N/A
303-825 Denver Qwest Corporation N/A
303-826 Denver USA Mobility Wireless N/A
303-827 Longmont Multiple N/A
303-828 Denver Multiple N/A
303-829 Denver Cellco Partnership N/A
303-830 Denver Multiple N/A
303-831 Denver Qwest Corporation N/A
303-832 Denver Qwest Corporation N/A
303-833 Denver Qwest Corporation N/A
303-834 Longmont Multiple 9/27/2006
303-835 Denver Multiple N/A
303-836 Denver Communications Unlimited N/A
303-837 Denver Qwest Corporation N/A
303-838 Deckers Qwest Corporation N/A
303-839 Denver Qwest Corporation N/A
303-840 Denver Qwest Corporation N/A
303-841 Denver Qwest Corporation N/A
303-842 Denver Multiple N/A
303-843 Denver Qwest Corporation N/A
303-844 Denver Qwest Corporation N/A
303-845 Longmont Multiple N/A
303-846 Denver Qwest Corporation N/A
303-847 Denver Multiple N/A
303-848 Longmont Multiple N/A
303-849 Roggen Roggen Tel. Coop. Co. N/A
303-850 Denver Qwest Corporation N/A
303-851 Denver USA Mobility Wireless N/A
303-852 Denver USA Mobility Wireless N/A
303-853 Denver Qwest Corporation N/A
303-854 Denver Multiple N/A
303-855 Denver USA Mobility Wireless N/A
303-856 Denver Multiple N/A
303-857 Fort Lupton Multiple N/A
303-858 Denver Qwest Corporation N/A
303-859 Denver Multiple N/A
303-860 Denver Qwest Corporation N/A
303-861 Denver Qwest Corporation N/A
303-862 Denver Multiple 6/4/2005
303-863 Denver Qwest Corporation N/A
303-864 Denver Qwest Corporation N/A
303-865 Denver Multiple N/A
303-866 Denver Qwest Corporation N/A
303-867 Denver Multiple 11/4/2005
303-868 Denver Cellco Partnership N/A
303-869 Denver Qwest Corporation N/A
303-870 Denver Cellco Partnership N/A
303-871 Denver Qwest Corporation N/A
303-872 Denver Multiple N/A
303-873 Denver Qwest Corporation N/A
303-874 Denver Multiple N/A
303-875 Denver T-Mobile USA N/A
303-876 Denver MCIMetro Access Transmission Services N/A
303-877 Denver Cellco Partnership N/A
303-878 Denver USA Mobility Wireless N/A
303-879 Denver Onvoy N/A
303-880 Denver Cellco Partnership N/A
303-881 Denver New Cingular Wireless PCS N/A
303-882 Denver New Cingular Wireless PCS N/A
303-883 Denver New Cingular Wireless PCS N/A
303-884 Denver New Cingular Wireless PCS N/A
303-885 Denver New Cingular Wireless PCS 4/12/2001
303-886 Denver New Cingular Wireless PCS 4/12/2001
303-887 Denver New Cingular Wireless PCS 4/12/2001
303-888 Denver New Cingular Wireless PCS N/A
303-889 Denver Multiple N/A
303-890 Denver USA Mobility Wireless N/A
303-891 Denver USA Mobility Wireless N/A
303-892 Denver Qwest Corporation N/A
303-893 Denver Qwest Corporation N/A
303-894 Denver Qwest Corporation N/A
303-895 Denver Multiple N/A
303-896 Denver Qwest Corporation N/A
303-897 Denver USA Mobility Wireless N/A
303-898 Denver New Cingular Wireless PCS N/A
303-899 Denver Qwest Corporation N/A
303-900-XXXX --- 303-999-XXXX
NPANXX Area served[1] Provider[2] Date[3]
303-900 Georgetown Multiple 1/10/2007
303-901 Denver T-Mobile USA N/A
303-902 Denver Cellco Partnership N/A
303-903 Denver Cellco Partnership N/A
303-904 Denver Qwest Corporation N/A
303-905 Denver Cellco Partnership N/A
303-906 Denver Cellco Partnership N/A
303-907 Denver Cellco Partnership N/A
303-908 Denver Cellco Partnership N/A
303-909 Denver Cellco Partnership N/A
303-910 Denver Cellco Partnership N/A
303-912 Denver Cellco Partnership N/A
303-913 Denver Cellco Partnership N/A
303-914 Denver Qwest Corporation N/A
303-915 Denver Cellco Partnership N/A
303-916 Denver Cellco Partnership N/A
303-917 Denver Cellco Partnership N/A
303-918 Denver Cellco Partnership N/A
303-919 Denver Cellco Partnership N/A
303-920 Denver Qwest Corporation N/A
303-921 Denver Cellco Partnership N/A
303-922 Denver Qwest Corporation N/A
303-923 Denver Multiple N/A
303-924 Denver Qwest Corporation N/A
303-925 Denver Qwest Corporation N/A
303-926 Denver Qwest Corporation N/A
303-927 Denver Multiple N/A
303-928 Denver Multiple N/A
303-929 Denver Cellco Partnership N/A
303-930 Denver Qwest Corporation N/A
303-931 Denver T-Mobile USA N/A
303-932 Denver Qwest Corporation N/A
303-933 Denver Qwest Corporation N/A
303-934 Denver Qwest Corporation N/A
303-935 Denver Qwest Corporation N/A
303-936 Denver Qwest Corporation N/A
303-937 Denver Qwest Corporation N/A
303-938 Denver Qwest Corporation N/A
303-939 Denver Qwest Corporation N/A
303-940 Denver Qwest Corporation N/A
303-941 Denver Cellco Partnership N/A
303-942 Denver Multiple N/A
303-943 Denver Multiple 9/9/2021
303-944 Denver T-Mobile USA N/A
303-945 Denver Multiple N/A
303-946 Denver T-Mobile USA N/A
303-947 Denver Cellco Partnership N/A
303-948 Denver Qwest Corporation N/A
303-949 Denver T-Mobile USA N/A
303-951 Denver Multiple N/A
303-952 Denver Multiple N/A
303-953 Denver Multiple N/A
303-954 Denver Multiple N/A
303-955 Denver Multiple N/A
303-956 Fort Lupton New Cingular Wireless PCS N/A
303-957 Denver Multiple N/A
303-960 Denver T-Mobile USA N/A
303-961 Denver T-Mobile USA N/A
303-962 Denver Onvoy 7/14/2005
303-963 Denver Multiple N/A
303-964 Denver Qwest Corporation N/A
303-965 Denver Qwest Corporation N/A
303-966 Denver Qwest Corporation N/A
303-967 Denver Multiple N/A
303-968 Denver Multiple N/A
303-969 Denver Qwest Corporation N/A
303-970 Deckers Onvoy 3/31/2022
303-971 Denver Qwest Corporation N/A
303-972 Denver Qwest Corporation N/A
303-973 Denver Qwest Corporation N/A
303-974 Denver Multiple N/A
303-975 Denver Multiple N/A
303-977 Denver Qwest Corporation N/A
303-978 Denver Qwest Corporation N/A
303-979 Denver Qwest Corporation N/A
303-980 Denver Qwest Corporation N/A
303-981 Denver Cellco Partnership N/A
303-982 Denver Qwest Corporation N/A
303-984 Denver Qwest Corporation N/A
303-985 Denver Qwest Corporation N/A
303-986 Denver Qwest Corporation N/A
303-987 Denver Qwest Corporation N/A
303-988 Denver Qwest Corporation N/A
303-989 Denver Qwest Corporation N/A
303-990 Fort Lupton Multiple 5/16/2006
303-991 Denver MCIMetro Access Transmission Services N/A
303-992 Denver Qwest Corporation N/A
303-993 Denver Multiple 3/27/2007
303-994 Denver T-Mobile USA N/A
303-995 Denver T-Mobile USA N/A
303-996 Denver Electric Lightwave N/A
303-997 Denver Multiple N/A
303-998 Denver Qwest Corporation N/A
303-999 Denver Multiple 8/24/2007
  1. 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.
  2. A single provider refers to the original company controlling a whole NPA-NXX block (10,000 phone numbers). With Number Pooling, NPA-NXX blocks can be split into ten 1,000 phone number blocks and handed over to other service providers (available in the USA and Puerto Rico).
  3. Assignment date. N/A: unavailable date or central office code assigned before 2001.
  4. NXX prefixes last updated: February 13, 2026

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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