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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 783 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 10:58:47 AM (Mountain Time Zone).

303 area code location on a map

*For exact NPA boundaries see official 303 area code map

More Colorado area codes:

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Locate any 303-NXX prefix:

NPANXX Area served1 Date2
303-200 Denver N/A
303-201 Denver N/A
303-202 Denver N/A
303-203 Denver N/A
303-204 Denver N/A
303-205 Denver N/A
303-206 Denver N/A
303-207 Denver N/A
303-208 Denver N/A
303-209 Denver N/A
303-210 Denver N/A
303-212 Denver N/A
303-213 Denver N/A
303-214 Denver N/A
303-215 Denver N/A
303-216 Denver N/A
303-217 Denver N/A
303-218 Denver N/A
303-219 Denver N/A
303-220 Denver N/A
303-221 Denver N/A
303-222 Denver N/A
303-223 Denver N/A
303-224 Denver N/A
303-225 Denver N/A
303-226 Denver N/A
303-227 Denver N/A
303-228 Denver N/A
303-229 Denver N/A
303-230 Denver N/A
303-231 Denver N/A
303-232 Denver N/A
303-233 Denver N/A
303-234 Denver N/A
303-235 Denver N/A
303-236 Denver N/A
303-237 Denver N/A
303-238 Denver N/A
303-239 Denver N/A
303-240 Denver N/A
303-241 Denver N/A
303-242 Denver N/A
303-243 Denver N/A
303-244 Denver N/A
303-245 Denver N/A
303-246 Denver N/A
303-247 Denver N/A
303-248 Denver N/A
303-249 Denver N/A
303-250 Denver N/A
303-251 Denver N/A
303-252 Denver N/A
303-253 Denver N/A
303-254 Denver N/A
303-255 Denver N/A
303-256 Denver N/A
303-257 Denver N/A
303-258 Denver N/A
303-259 Denver N/A
303-260 Denver N/A
303-261 Denver N/A
303-262 Denver N/A
303-263 Denver N/A
303-264 Denver N/A
303-265 Denver N/A
303-266 Denver N/A
303-267 Denver N/A
303-268 Denver N/A
303-269 Denver N/A
303-270 Denver N/A
303-271 Denver N/A
303-272 Denver N/A
303-273 Denver N/A
303-274 Denver N/A
303-275 Denver N/A
303-276 Denver 8/19/2021
303-277 Denver N/A
303-278 Denver N/A
303-279 Denver N/A
303-280 Denver N/A
303-281 Denver N/A
303-282 Denver N/A
303-283 Denver N/A
303-284 Denver N/A
303-285 Denver N/A
303-286 Denver N/A
303-287 Denver N/A
303-288 Denver N/A
303-289 Denver N/A
303-290 Denver N/A
303-291 Denver N/A
303-292 Denver N/A
303-293 Denver N/A
303-294 Denver N/A
303-295 Denver N/A
303-296 Denver N/A
303-297 Denver N/A
303-298 Denver N/A
303-299 Denver N/A

NPANXX Area served1 Date2
303-300 Denver N/A
303-301 Denver N/A
303-302 Denver N/A
303-304 Fort Lupton 11/18/2004
303-305 Denver N/A
303-306 Denver N/A
303-307 Denver N/A
303-308 Denver N/A
303-309 Denver N/A
303-310 Denver N/A
303-312 Denver N/A
303-313 Denver N/A
303-314 Denver N/A
303-315 Denver N/A
303-316 Denver N/A
303-317 Denver N/A
303-318 Denver N/A
303-319 Denver 8/12/2004
303-320 Denver N/A
303-321 Denver N/A
303-322 Denver N/A
303-323 Denver N/A
303-324 Denver N/A
303-325 Denver N/A
303-326 Denver N/A
303-327 Denver N/A
303-328 Denver N/A
303-329 Denver N/A
303-330 Denver 3/9/2006
303-331 Denver N/A
303-332 Denver N/A
303-333 Denver N/A
303-334 Denver N/A
303-335 Denver N/A
303-336 Denver N/A
303-337 Denver N/A
303-338 Denver N/A
303-339 Denver 12/15/2003
303-340 Denver N/A
303-341 Denver N/A
303-342 Denver N/A
303-343 Denver N/A
303-344 Denver N/A
303-345 Denver N/A
303-346 Denver N/A
303-347 Denver N/A
303-348 Denver N/A
303-349 Denver N/A
303-350 Denver N/A
303-351 Deckers 11/8/2006
303-352 Denver N/A
303-353 Denver N/A
303-354 Denver N/A
303-355 Denver N/A
303-356 Denver N/A
303-357 Denver N/A
303-358 Denver N/A
303-359 Denver N/A
303-360 Denver N/A
303-361 Denver N/A
303-362 Denver N/A
303-363 Denver N/A
303-364 Denver N/A
303-365 Denver N/A
303-366 Denver N/A
303-367 Denver N/A
303-368 Denver N/A
303-369 Denver N/A
303-370 Denver N/A
303-371 Denver N/A
303-372 Denver N/A
303-373 Denver N/A
303-374 Denver N/A
303-375 Denver N/A
303-376 Denver N/A
303-377 Denver N/A
303-378 Denver N/A
303-379 Denver N/A
303-380 Denver N/A
303-381 Denver N/A
303-382 Denver N/A
303-383 Denver N/A
303-384 Denver N/A
303-385 Denver N/A
303-386 Denver N/A
303-387 Denver N/A
303-388 Denver N/A
303-389 Denver N/A
303-390 Denver N/A
303-391 Denver N/A
303-392 Denver N/A
303-393 Denver N/A
303-394 Denver N/A
303-395 Denver N/A
303-396 Denver 6/1/2005
303-397 Denver N/A
303-398 Denver N/A
303-399 Denver N/A

NPANXX Area served1 Date2
303-400 Denver N/A
303-401 Denver N/A
303-402 Denver N/A
303-403 Denver N/A
303-404 Denver N/A
303-405 Denver N/A
303-406 Denver N/A
303-407 Denver N/A
303-408 Denver N/A
303-409 Denver N/A
303-410 Denver N/A
303-412 Denver N/A
303-413 Denver N/A
303-414 Denver N/A
303-415 Denver N/A
303-416 Denver N/A
303-417 Denver N/A
303-418 Denver N/A
303-419 Denver N/A
303-420 Denver N/A
303-421 Denver N/A
303-422 Denver N/A
303-423 Denver N/A
303-424 Denver N/A
303-425 Denver N/A
303-426 Denver N/A
303-427 Denver N/A
303-428 Denver N/A
303-429 Denver N/A
303-430 Denver N/A
303-431 Denver N/A
303-432 Denver N/A
303-433 Denver N/A
303-434 Denver N/A
303-435 Denver N/A
303-436 Denver N/A
303-437 Denver N/A
303-438 Denver N/A
303-439 Denver N/A
303-440 Denver N/A
303-441 Denver N/A
303-442 Denver N/A
303-443 Denver N/A
303-444 Denver N/A
303-445 Denver N/A
303-446 Denver N/A
303-447 Denver N/A
303-448 Denver N/A
303-449 Denver N/A
303-450 Denver N/A
303-451 Denver N/A
303-452 Denver N/A
303-453 Denver N/A
303-454 Denver N/A
303-455 Denver N/A
303-456 Denver N/A
303-457 Denver N/A
303-458 Denver N/A
303-459 Denver N/A
303-460 Denver N/A
303-461 Denver N/A
303-462 Denver N/A
303-463 Denver N/A
303-464 Denver N/A
303-465 Denver N/A
303-466 Denver N/A
303-467 Denver N/A
303-468 Denver 5/24/2001
303-469 Denver N/A
303-470 Denver N/A
303-471 Denver N/A
303-472 Denver N/A
303-473 Denver N/A
303-474 Denver N/A
303-475 Denver N/A
303-476 Denver N/A
303-477 Denver N/A
303-478 Denver N/A
303-479 Denver N/A
303-480 Denver N/A
303-481 Denver N/A
303-482 Denver N/A
303-483 Denver N/A
303-484 Denver N/A
303-485 Longmont N/A
303-486 Denver N/A
303-487 Denver N/A
303-488 Denver N/A
303-489 Denver N/A
303-490 Denver N/A
303-491 Denver N/A
303-492 Denver N/A
303-493 Denver N/A
303-494 Denver N/A
303-495 Denver N/A
303-496 Denver 4/8/2004
303-497 Denver N/A
303-498 Denver 4/22/2005
303-499 Denver N/A

NPANXX Area served1 Date2
303-500 Hudson 1/4/2005
303-501 Denver 1/26/2006
303-502 Fort Lupton 12/13/2005
303-503 Denver N/A
303-504 Denver N/A
303-505 Denver 11/9/2012
303-506 Fort Lupton 9/13/2001
303-507 Denver N/A
303-508 Denver N/A
303-509 Denver N/A
303-510 Denver N/A
303-512 Denver N/A
303-513 Denver 2/15/2002
303-514 Denver N/A
303-515 Denver 11/14/2011
303-516 Denver N/A
303-517 Denver N/A
303-518 Denver N/A
303-519 Denver N/A
303-520 Denver N/A
303-521 Denver N/A
303-522 Denver N/A
303-523 Denver N/A
303-524 Denver N/A
303-525 Denver N/A
303-526 Denver N/A
303-527 Denver N/A
303-528 Denver N/A
303-529 Denver 10/7/2019
303-530 Denver N/A
303-531 Denver N/A
303-532 Longmont N/A
303-533 Denver N/A
303-534 Denver N/A
303-535 Fort Lupton N/A
303-536 Hudson N/A
303-537 Denver N/A
303-538 Denver N/A
303-539 Denver N/A
303-540 Denver N/A
303-541 Denver N/A
303-542 Denver N/A
303-543 Denver N/A
303-544 Denver N/A
303-545 Denver N/A
303-546 Denver N/A
303-547 Denver N/A
303-548 Denver N/A
303-549 Denver N/A
303-550 Denver N/A
303-551 Denver N/A
303-552 Denver N/A
303-553 Denver N/A
303-554 Denver N/A
303-556 Denver N/A
303-557 Denver N/A
303-558 Denver N/A
303-559 Denver N/A
303-560 Denver N/A
303-561 Denver N/A
303-562 Denver N/A
303-563 Denver N/A
303-564 Denver N/A
303-565 Denver N/A
303-566 Denver N/A
303-567 Denver N/A
303-568 Denver N/A
303-569 Georgetown N/A
303-570 Denver N/A
303-571 Denver N/A
303-572 Denver N/A
303-573 Denver N/A
303-574 Denver N/A
303-575 Denver N/A
303-576 Denver N/A
303-577 Denver N/A
303-578 Keenesburg 9/12/2006
303-579 Denver N/A
303-580 Denver N/A
303-581 Denver N/A
303-582 Denver N/A
303-583 Denver N/A
303-584 Denver N/A
303-585 Denver N/A
303-586 Denver N/A
303-587 Denver N/A
303-588 Denver N/A
303-589 Denver N/A
303-590 Denver N/A
303-591 Denver N/A
303-592 Denver N/A
303-593 Denver N/A
303-594 Denver N/A
303-595 Denver N/A
303-596 Denver N/A
303-597 Denver N/A
303-598 Denver N/A
303-599 Denver N/A

NPANXX Area served1 Date2
303-600 Denver N/A
303-601 Denver N/A
303-602 Denver N/A
303-603 Denver N/A
303-604 Denver N/A
303-605 Denver N/A
303-606 Denver N/A
303-607 Denver N/A
303-608 Denver N/A
303-609 Denver N/A
303-610 Denver N/A
303-612 Denver N/A
303-613 Denver N/A
303-614 Denver N/A
303-615 Denver N/A
303-616 Denver N/A
303-617 Denver N/A
303-618 Denver N/A
303-619 Denver N/A
303-620 Denver N/A
303-621 Denver N/A
303-622 Strasburg N/A
303-623 Denver N/A
303-624 Denver N/A
303-625 Denver N/A
303-626 Denver N/A
303-627 Denver N/A
303-628 Denver N/A
303-629 Denver N/A
303-630 Denver N/A
303-632 Denver N/A
303-633 Denver N/A
303-634 Denver N/A
303-635 Denver N/A
303-636 Denver N/A
303-637 Denver N/A
303-638 Denver N/A
303-639 Denver N/A
303-640 Denver N/A
303-641 Denver N/A
303-642 Denver N/A
303-643 Denver N/A
303-644 Bennett N/A
303-645 Denver N/A
303-646 Denver N/A
303-647 Deckers N/A
303-648 Denver N/A
303-649 Denver N/A
303-650 Denver N/A
303-651 Longmont N/A
303-652 Longmont N/A
303-653 Denver N/A
303-654 Denver N/A
303-655 Denver N/A
303-656 Denver N/A
303-657 Denver N/A
303-658 Denver N/A
303-659 Denver N/A
303-660 Denver N/A
303-661 Denver N/A
303-662 Denver N/A
303-663 Denver N/A
303-664 Denver N/A
303-665 Denver N/A
303-666 Denver N/A
303-667 Denver N/A
303-668 Denver N/A
303-669 Denver N/A
303-670 Denver N/A
303-671 Denver N/A
303-672 Denver N/A
303-673 Denver N/A
303-674 Denver N/A
303-675 Denver N/A
303-676 Denver N/A
303-677 Denver N/A
303-678 Longmont N/A
303-679 Denver N/A
303-680 Denver N/A
303-681 Denver N/A
303-682 Longmont N/A
303-683 Denver N/A
303-684 Longmont N/A
303-685 Denver N/A
303-686 Denver N/A
303-687 Denver N/A
303-688 Denver N/A
303-689 Denver N/A
303-690 Denver N/A
303-691 Denver N/A
303-692 Denver N/A
303-693 Denver N/A
303-694 Denver N/A
303-695 Denver N/A
303-696 Denver N/A
303-697 Denver N/A
303-698 Denver N/A
303-699 Denver N/A

NPANXX Area served1 Date2
303-701 Denver N/A
303-702 Longmont N/A
303-703 Denver N/A
303-704 Denver N/A
303-705 Denver N/A
303-706 Denver N/A
303-707 Denver N/A
303-708 Denver N/A
303-709 Longmont N/A
303-710 Fort Lupton N/A
303-712 Denver N/A
303-713 Denver N/A
303-714 Denver N/A
303-715 Denver N/A
303-716 Denver N/A
303-717 Fort Lupton N/A
303-718 Fort Lupton N/A
303-719 Deer Trail 11/16/2006
303-720 Fort Lupton 6/13/2008
303-721 Denver N/A
303-722 Denver N/A
303-723 Denver N/A
303-724 Denver N/A
303-725 Denver N/A
303-726 Denver N/A
303-727 Denver N/A
303-728 Denver N/A
303-729 Denver N/A
303-730 Denver N/A
303-731 Denver N/A
303-732 Keenesburg N/A
303-733 Denver N/A
303-734 Denver N/A
303-735 Denver N/A
303-736 Denver N/A
303-737 Denver N/A
303-738 Denver N/A
303-739 Denver N/A
303-740 Denver N/A
303-741 Denver N/A
303-742 Denver N/A
303-743 Denver N/A
303-744 Denver N/A
303-745 Denver N/A
303-746 Longmont N/A
303-747 Allenspark/ Lyons N/A
303-748 Denver N/A
303-749 Denver N/A
303-750 Denver N/A
303-751 Denver N/A
303-752 Denver N/A
303-753 Denver N/A
303-754 Denver N/A
303-755 Denver N/A
303-756 Denver N/A
303-757 Denver N/A
303-758 Denver N/A
303-759 Denver N/A
303-760 Denver N/A
303-761 Denver N/A
303-762 Denver N/A
303-763 Denver N/A
303-764 Denver N/A
303-765 Denver N/A
303-766 Denver N/A
303-767 Denver N/A
303-768 Denver N/A
303-769 Deer Trail N/A
303-770 Denver N/A
303-771 Denver N/A
303-772 Longmont N/A
303-773 Denver N/A
303-774 Longmont N/A
303-775 Longmont N/A
303-776 Longmont N/A
303-777 Denver N/A
303-778 Denver N/A
303-779 Denver N/A
303-780 Denver N/A
303-781 Denver N/A
303-782 Denver N/A
303-783 Denver N/A
303-784 Denver N/A
303-785 Denver N/A
303-786 Denver N/A
303-787 Denver N/A
303-788 Denver N/A
303-789 Denver N/A
303-790 Denver N/A
303-791 Denver N/A
303-792 Denver N/A
303-793 Denver N/A
303-794 Denver N/A
303-795 Denver N/A
303-796 Denver N/A
303-797 Denver N/A
303-798 Denver N/A
303-799 Denver N/A

NPANXX Area served1 Date2
303-800 Denver N/A
303-801 Denver N/A
303-802 Denver N/A
303-803 Denver N/A
303-804 Denver N/A
303-805 Denver N/A
303-806 Denver N/A
303-807 Denver N/A
303-808 Denver N/A
303-809 Denver N/A
303-810 Denver N/A
303-812 Denver N/A
303-813 Denver N/A
303-814 Denver N/A
303-815 Denver 2/3/2005
303-816 Deckers N/A
303-817 Denver N/A
303-818 Denver N/A
303-819 Denver N/A
303-820 Denver N/A
303-821 Denver N/A
303-822 Byers N/A
303-823 Allenspark/ Lyons N/A
303-824 Denver N/A
303-825 Denver N/A
303-826 Denver N/A
303-827 Longmont N/A
303-828 Denver N/A
303-829 Denver N/A
303-830 Denver N/A
303-831 Denver N/A
303-832 Denver N/A
303-833 Denver N/A
303-834 Longmont 9/27/2006
303-835 Denver N/A
303-836 Denver N/A
303-837 Denver N/A
303-838 Deckers N/A
303-839 Denver N/A
303-840 Denver N/A
303-841 Denver N/A
303-842 Denver N/A
303-843 Denver N/A
303-844 Denver N/A
303-845 Longmont N/A
303-846 Denver N/A
303-847 Denver N/A
303-848 Longmont N/A
303-849 Roggen N/A
303-850 Denver N/A
303-851 Denver N/A
303-852 Denver N/A
303-853 Denver N/A
303-854 Denver N/A
303-855 Denver N/A
303-856 Denver N/A
303-857 Fort Lupton N/A
303-858 Denver N/A
303-859 Denver N/A
303-860 Denver N/A
303-861 Denver N/A
303-862 Denver 6/4/2005
303-863 Denver N/A
303-864 Denver N/A
303-865 Denver N/A
303-866 Denver N/A
303-867 Denver 11/4/2005
303-868 Denver N/A
303-869 Denver N/A
303-870 Denver N/A
303-871 Denver N/A
303-872 Denver N/A
303-873 Denver N/A
303-874 Denver N/A
303-875 Denver N/A
303-876 Denver N/A
303-877 Denver N/A
303-878 Denver N/A
303-879 Denver N/A
303-880 Denver N/A
303-881 Denver N/A
303-882 Denver N/A
303-883 Denver N/A
303-884 Denver N/A
303-885 Denver 4/12/2001
303-886 Denver 4/12/2001
303-887 Denver 4/12/2001
303-888 Denver N/A
303-889 Denver N/A
303-890 Denver N/A
303-891 Denver N/A
303-892 Denver N/A
303-893 Denver N/A
303-894 Denver N/A
303-895 Denver N/A
303-896 Denver N/A
303-897 Denver N/A
303-898 Denver N/A
303-899 Denver N/A

NPANXX Area served1 Date2
303-900 Georgetown 1/10/2007
303-901 Denver N/A
303-902 Denver N/A
303-903 Denver N/A
303-904 Denver N/A
303-905 Denver N/A
303-906 Denver N/A
303-907 Denver N/A
303-908 Denver N/A
303-909 Denver N/A
303-910 Denver N/A
303-912 Denver N/A
303-913 Denver N/A
303-914 Denver N/A
303-915 Denver N/A
303-916 Denver N/A
303-917 Denver N/A
303-918 Denver N/A
303-919 Denver N/A
303-920 Denver N/A
303-921 Denver N/A
303-922 Denver N/A
303-923 Denver N/A
303-924 Denver N/A
303-925 Denver N/A
303-926 Denver N/A
303-927 Denver N/A
303-928 Denver N/A
303-929 Denver N/A
303-930 Denver N/A
303-931 Denver N/A
303-932 Denver N/A
303-933 Denver N/A
303-934 Denver N/A
303-935 Denver N/A
303-936 Denver N/A
303-937 Denver N/A
303-938 Denver N/A
303-939 Denver N/A
303-940 Denver N/A
303-941 Denver N/A
303-942 Denver N/A
303-943 Denver 9/9/2021
303-944 Denver N/A
303-945 Denver N/A
303-946 Denver N/A
303-947 Denver N/A
303-948 Denver N/A
303-949 Denver N/A
303-951 Denver N/A
303-952 Denver N/A
303-953 Denver N/A
303-954 Denver N/A
303-955 Denver N/A
303-956 Fort Lupton N/A
303-957 Denver N/A
303-960 Denver N/A
303-961 Denver N/A
303-962 Denver 7/14/2005
303-963 Denver N/A
303-964 Denver N/A
303-965 Denver N/A
303-966 Denver N/A
303-967 Denver N/A
303-968 Denver N/A
303-969 Denver N/A
303-970 Deckers 3/31/2022
303-971 Denver N/A
303-972 Denver N/A
303-973 Denver N/A
303-974 Denver N/A
303-975 Denver N/A
303-977 Denver N/A
303-978 Denver N/A
303-979 Denver N/A
303-980 Denver N/A
303-981 Denver N/A
303-982 Denver N/A
303-984 Denver N/A
303-985 Denver N/A
303-986 Denver N/A
303-987 Denver N/A
303-988 Denver N/A
303-989 Denver N/A
303-990 Fort Lupton 5/16/2006
303-991 Denver N/A
303-992 Denver N/A
303-993 Denver 3/27/2007
303-994 Denver N/A
303-995 Denver N/A
303-996 Denver N/A
303-997 Denver N/A
303-998 Denver N/A
303-999 Denver 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. Assignment date. N/A - mostly central office codes assigned before 2001.
Top

Cities in area code 303

City1 County Time2
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 Zone (currently 10:58:47 AM).
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