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406 Area Code

Area code 406 is in Montana (MT), USA and some of the main locations it covers are Billings, Missoula, Great Falls, etc. (jump to city list below).

In service date for area code 406: January 01, 1947.

The current time for places served by area code 406 is 02:33:22 PM (Mountain Time Zone).

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406 phone number location

NPANXX Area served1 Date2
406-200 Billings 4/17/2012
406-201 Forsyth 1/21/2003
406-202 Helena 4/18/2001
406-203 Missoula N/A
406-204 Helena N/A
406-205 Great Falls N/A
406-206 Billings N/A
406-207 Missoula 4/18/2001
406-208 Billings 4/18/2001
406-209 Bozeman 4/18/2001
406-210 Seeley Lake N/A
406-212 Kalispell 4/18/2001
406-213 Colstrip 5/6/2003
406-214 Missoula N/A
406-215 Missoula N/A
406-216 Great Falls N/A
406-217 Great Falls N/A
406-218 Missoula 8/3/2004
406-219 Bozeman 2/13/2003
406-220 Livingston N/A
406-221 Butte 2/13/2003
406-222 Livingston N/A
406-223 Livingston N/A
406-224 Livingston N/A
406-225 Boulder N/A
406-226 East Glacier Park N/A
406-227 Helena N/A
406-228 Glasgow N/A
406-229 Cut Bank 1/20/2003
406-230 Glasgow N/A
406-231 Great Falls 7/12/2001
406-232 Miles City N/A
406-233 Miles City N/A
406-234 Miles City N/A
406-235 Wolf Creek N/A
406-236 Neihart N/A
406-237 Billings N/A
406-238 Billings N/A
406-239 Missoula N/A
406-240 Missoula N/A
406-241 Missoula N/A
406-242 Thompson Falls 3/18/2003
406-243 Missoula N/A
406-244 Potomac N/A
406-245 Billings N/A
406-246 Dixon N/A
406-247 Billings N/A
406-248 Billings N/A
406-249 Kalispell N/A
406-250 Kalispell N/A
406-251 Missoula N/A
406-252 Billings N/A
406-253 Kalispell N/A
406-254 Billings N/A
406-255 Billings N/A
406-256 Billings N/A
406-257 Kalispell N/A
406-258 Missoula N/A
406-259 Billings N/A
406-260 Kalispell N/A
406-261 Kalispell N/A
406-262 Havre N/A
406-263 Glasgow N/A
406-264 Fort Shaw N/A
406-265 Havre N/A
406-266 Townsend N/A
406-267 Divide N/A
406-268 Great Falls N/A
406-269 St Regis 10/12/2010
406-270 Kalispell N/A
406-271 Conrad N/A
406-272 Billings N/A
406-273 Missoula N/A
406-274 Missoula N/A
406-275 Pablo N/A
406-276 Lima N/A
406-277 Belt N/A
406-278 Conrad N/A
406-279 Valier N/A
406-280 St Regis 3/18/2003
406-281 Billings N/A
406-282 Manhattan N/A
406-283 Libby N/A
406-284 Manhattan N/A
406-285 Three Forks N/A
406-286 Reserve N/A
406-287 Whitehall N/A
406-288 Drummond N/A
406-289 Conrad N/A
406-290 Columbus 3/14/2007
406-291 Libby N/A
406-292 Joplin N/A
406-293 Libby N/A
406-294 Billings N/A
406-295 Troy N/A
406-296 Eureka N/A
406-297 Eureka Rural N/A
406-298 Columbus N/A
406-299 Butte 1/23/2003

NPANXX Area served1 Date2
406-300 Kalispell 7/17/2013
406-301 Malta 5/6/2008
406-302 Wolf Creek 10/3/2011
406-303 Missoula 4/17/2012
406-304 Missoula 3/25/2016
406-305 White Sulphur Springs 10/20/2010
406-306 Manhattan 10/20/2017
406-308 Cascade 9/5/2017
406-309 Kalispell 7/1/2011
406-310 Butte N/A
406-312 Bozeman N/A
406-313 Boulder 11/16/2012
406-314 Kalispell 10/21/2004
406-315 Great Falls N/A
406-316 Boulder 7/12/2019
406-317 Missoula N/A
406-318 Billings 2/17/2011
406-319 Polson N/A
406-320 Roundup N/A
406-321 Columbus N/A
406-322 Columbus N/A
406-323 Roundup N/A
406-324 Helena N/A
406-325 Billings N/A
406-326 Reed Point N/A
406-327 Missoula N/A
406-328 Absarokee N/A
406-329 Missoula N/A
406-330 Clinton N/A
406-331 Roundup N/A
406-332 Pablo N/A
406-333 Livingston N/A
406-334 Libby 5/10/2004
406-335 Sweet Grass N/A
406-336 North Cut Bank N/A
406-337 Kevin/ Oilmont N/A
406-338 Browning N/A
406-339 Ethridge N/A
406-340 Lima N/A
406-341 Manhattan 7/6/2020
406-342 Hysham N/A
406-343 Wyola N/A
406-344 Havre 7/28/2016
406-345 Glendive N/A
406-346 Forsyth 7/11/2002
406-347 Rosebud N/A
406-348 Huntley N/A
406-349 Alta N/A
406-350 Lewistown N/A
406-351 Forsyth N/A
406-352 Box Elder N/A
406-353 Harlem N/A
406-354 Rock Springs N/A
406-355 Rudyard N/A
406-356 Forsyth N/A
406-357 Chinook N/A
406-358 Melstone N/A
406-359 Glendive N/A
406-360 Hamilton N/A
406-361 Hamilton 6/9/2011
406-362 Lincoln N/A
406-363 Hamilton N/A
406-364 Hinsdale N/A
406-365 Glendive N/A
406-366 Lewistown N/A
406-367 North Glasgow N/A
406-368 Canyon Creek N/A
406-369 Hamilton N/A
406-370 Missoula N/A
406-371 Billings 7/27/2004
406-372 Kremlin N/A
406-373 Billings N/A
406-374 Moore N/A
406-375 Hamilton N/A
406-376 Gildford N/A
406-377 Glendive N/A
406-378 Big Sandy N/A
406-379 Turner N/A
406-380 Lewistown N/A
406-381 Hamilton N/A
406-382 Superior 3/18/2003
406-383 Dodson N/A
406-384 Billings N/A
406-385 Westby N/A
406-386 Hopp/ Illiad N/A
406-387 Hungry Horse N/A
406-388 Belgrade N/A
406-389 Helena 9/18/2013
406-390 South Havre N/A
406-391 Cut Bank N/A
406-392 North Wolf Point N/A
406-393 Somers 3/30/2006
406-394 North Havre N/A
406-395 South Havre N/A
406-396 Missoula 11/26/2003
406-397 Hingham N/A
406-398 North Havre N/A
406-399 South Havre N/A

NPANXX Area served1 Date2
406-400 Havre 4/27/2017
406-401 Great Falls 5/29/2019
406-402 Great Falls 8/4/2017
406-403 Great Falls 3/8/2006
406-404 Bozeman 4/3/2012
406-405 Libby 9/8/2022
406-407 Kalispell 8/16/2010
406-408 Hays 10/15/2019
406-409 Billings 5/29/2019
406-410 Helena N/A
406-412 Billings 5/22/2017
406-413 Billings 5/12/2015
406-414 Bozeman 12/7/2011
406-415 Deer Lodge 4/9/2010
406-416 Forsyth 6/17/2020
406-417 Helena 5/28/2008
406-418 Cooke City 8/20/2019
406-419 Victor 7/12/2019
406-420 Bigfork 2/28/2006
406-421 South Miles City N/A
406-422 Helena N/A
406-423 Hobson N/A
406-424 Shelby 11/12/2001
406-425 Red Lodge N/A
406-426 Red Lodge N/A
406-427 South Broadus N/A
406-428 Grass Range N/A
406-429 Winnett N/A
406-430 Helena N/A
406-431 Helena N/A
406-432 Devon N/A
406-433 Sidney N/A
406-434 Shelby N/A
406-435 Billings N/A
406-436 Broadus N/A
406-437 Helena 7/27/2004
406-438 Helena 2/6/2014
406-439 Helena N/A
406-440 Helena 7/1/2005
406-441 Helena N/A
406-442 Helena N/A
406-443 Helena N/A
406-444 Helena N/A
406-445 Red Lodge N/A
406-446 Red Lodge N/A
406-447 Helena N/A
406-448 North Poplar N/A
406-449 Helena N/A
406-450 Shelby N/A
406-451 Bozeman 8/4/2004
406-452 Great Falls N/A
406-453 Great Falls N/A
406-454 Great Falls N/A
406-455 Great Falls N/A
406-456 South Chester N/A
406-457 Helena N/A
406-458 Helena N/A
406-459 Helena N/A
406-460 Shelby N/A
406-461 Helena N/A
406-462 Winifred N/A
406-463 Power N/A
406-464 Roy N/A
406-465 Helena N/A
406-466 Choteau N/A
406-467 Fairfield N/A
406-468 Cascade N/A
406-469 Pendroy N/A
406-470 Shelby N/A
406-471 Kalispell 6/1/2005
406-472 Dupuyer N/A
406-473 Judith Gap N/A
406-474 Flaxville N/A
406-475 Helena N/A
406-476 Dutton N/A
406-477 Lame Deer N/A
406-478 Sidney N/A
406-479 Butte 10/3/2013
406-480 Sidney N/A
406-481 Missoula 06/21/2023
406-482 Sidney N/A
406-483 Dagmar N/A
406-484 Crooked Creek N/A
406-485 Circle N/A
406-486 Fallon N/A
406-487 Scobey N/A
406-488 Sidney N/A
406-489 Sidney N/A
406-490 Butte N/A
406-491 Butte N/A
406-492 Avon N/A
406-493 Missoula N/A
406-494 Butte N/A
406-495 Helena N/A
406-496 Butte N/A
406-497 Butte N/A
406-498 Butte N/A
406-499 Seeley Lake 3/18/2003

NPANXX Area served1 Date2
406-500 Billings 1/29/2019
406-501 Whitehall 8/20/2019
406-502 Helena 4/3/2012
406-503 Billings 04/05/2023
406-504 Fairfield 2/12/2021
406-505 Conrad 10/14/2010
406-506 Billings 6/1/2020
406-507 Whitefish 02/17/2023
406-508 Frenchtown 2/3/2012
406-510 Missoula 3/22/2017
406-512 Boulder 02/22/2023
406-513 Helena 4/8/2008
406-514 Culbertson 10/20/2010
406-515 Superior 10/12/2010
406-516 Laurel 04/27/2023
406-518 Gallatin Gateway 9/27/2011
406-519 Missoula N/A
406-520 Absarokee N/A
406-521 Townsend N/A
406-522 Bozeman N/A
406-523 Missoula N/A
406-524 Valley Industrial Park N/A
406-525 South Wolf Point N/A
406-526 Fort Peck N/A
406-527 Saco N/A
406-528 Ronan N/A
406-529 Missoula 9/16/2005
406-530 Laurel N/A
406-531 Missoula N/A
406-532 Missoula N/A
406-533 Butte N/A
406-534 Billings N/A
406-535 Lewistown N/A
406-537 Melville N/A
406-538 Lewistown N/A
406-539 Bozeman N/A
406-540 Missoula N/A
406-541 Missoula N/A
406-542 Missoula N/A
406-543 Missoula N/A
406-544 Missoula N/A
406-545 Billings 6/19/2002
406-546 Missoula N/A
406-547 White Sulphur Springs N/A
406-548 Bozeman N/A
406-549 Missoula N/A
406-550 Missoula N/A
406-551 Bozeman 6/19/2002
406-552 Missoula 6/19/2002
406-553 Divide N/A
406-554 North Broadus N/A
406-556 Bozeman N/A
406-557 Jordan N/A
406-558 Helena 6/19/2002
406-559 Anaconda N/A
406-560 Anaconda N/A
406-561 Billings 8/2/2017
406-562 Augusta N/A
406-563 Anaconda N/A
406-564 Great Falls 6/19/2002
406-565 Butte 6/19/2002
406-566 Stanford N/A
406-567 Denton N/A
406-568 Ryegate N/A
406-569 West Squaw Gap N/A
406-570 Bozeman N/A
406-571 Finley Point N/A
406-572 Martinsdale N/A
406-573 Browning N/A
406-574 Silvertip N/A
406-575 North Ryegate N/A
406-576 Conrad N/A
406-577 Bozeman N/A
406-578 Wilsall N/A
406-579 Bozeman N/A
406-580 Bozeman N/A
406-581 Bozeman N/A
406-582 Bozeman N/A
406-583 Bloomfield N/A
406-584 Lindsay N/A
406-585 Bozeman N/A
406-586 Bozeman N/A
406-587 Bozeman N/A
406-588 Carlyle N/A
406-589 Bozeman N/A
406-590 Great Falls N/A
406-591 Billings N/A
406-592 Busby N/A
406-593 Butte N/A
406-594 Helena N/A
406-595 Bozeman N/A
406-596 Dillon N/A
406-597 Shelby N/A
406-598 Billings N/A
406-599 Bozeman 10/26/2004

NPANXX Area served1 Date2
406-600 Bozeman 4/13/2006
406-601 Billings 11/8/2013
406-602 Bozeman 11/8/2013
406-603 Helena 11/8/2013
406-604 Great Falls 7/15/2011
406-605 Butte 4/18/2021
406-606 Billings 12/7/2012
406-607 Kalispell 11/8/2013
406-608 Billings 5/6/2021
406-609 Kalispell 3/24/2021
406-612 Swan Lake 10/11/2007
406-613 Bozeman 6/16/2022
406-614 Bigfork 10/13/2020
406-615 Thompson Falls 4/28/2014
406-616 Three Forks 7/1/2011
406-620 Billings 12/6/2005
406-621 Fort Benton N/A
406-622 Fort Benton N/A
406-623 Hardin 2/16/2005
406-624 Bozeman 2/3/2005
406-625 Stevensville N/A
406-626 Frenchtown N/A
406-627 East Conrad N/A
406-628 Laurel N/A
406-629 Hardin N/A
406-630 Sidney 2/16/2005
406-631 Elmo 7/26/2007
406-632 Harlowton N/A
406-633 Laurel N/A
406-634 Helena N/A
406-635 Terry N/A
406-636 Lavina N/A
406-637 Terry N/A
406-638 Hardin N/A
406-639 Lodgegrass N/A
406-640 West Yellowstone N/A
406-641 West Yellowstone N/A
406-642 Victor N/A
406-643 North Parkman 5/24/2007
406-644 Charlo N/A
406-645 Deer Lodge N/A
406-646 West Yellowstone N/A
406-647 Billings 7/3/2008
406-648 North Hinsdale N/A
406-649 St Regis N/A
406-650 Wolf Point N/A
406-651 Billings N/A
406-652 Billings N/A
406-653 Wolf Point N/A
406-654 Malta N/A
406-655 Billings N/A
406-656 Billings N/A
406-657 Billings N/A
406-658 South Malta N/A
406-659 North Parkman N/A
406-660 Dillon N/A
406-661 Billings N/A
406-662 Bridger N/A
406-663 Rapelje N/A
406-664 Belfry N/A
406-665 Hardin N/A
406-666 Fort Smith N/A
406-667 Broadview N/A
406-668 Fromberg N/A
406-669 Molt N/A
406-670 Billings N/A
406-671 Billings N/A
406-672 Billings N/A
406-673 Hays N/A
406-674 Whitewater N/A
406-675 Pablo N/A
406-676 Ronan N/A
406-677 Seeley Lake N/A
406-678 Haugan N/A
406-679 Hardin N/A
406-680 Malta 1/10/2005
406-681 Grant N/A
406-682 Ennis N/A
406-683 Dillon N/A
406-684 Twin Bridges N/A
406-685 Harrison N/A
406-686 Clyde Park N/A
406-687 W Glendive N/A
406-688 Scobey 2/10/2014
406-689 Wisdom N/A
406-690 Billings N/A
406-691 Anaconda N/A
406-692 Yellow Bay 10/11/2007
406-693 Warm Springs N/A
406-694 Billings 1/5/2005
406-695 Frazer N/A
406-696 Billings 6/15/2006
406-697 Billings 4/21/2005
406-698 Billings N/A
406-699 Hardin N/A
NPANXX Area served1 Date2
406-702 Billings 3/7/2012
406-703 Columbus 5/24/2021
406-707 Lewistown N/A
406-708 Lewistown 2/16/2005
406-709 Lakeside N/A
406-715 Lame Deer 9/22/2015
406-717 Billings 6/6/2018
406-718 Darby 4/12/2021
406-719 Fromberg 8/20/2019
406-720 Colstrip N/A
406-721 Missoula N/A
406-722 Alberton N/A
406-723 Butte N/A
406-724 Glentana N/A
406-725 Larslan N/A
406-726 Arlee N/A
406-727 Great Falls N/A
406-728 Missoula N/A
406-729 Wilsall 9/8/2016
406-730 Whitefish N/A
406-731 Great Falls N/A
406-732 St Mary N/A
406-733 Highwood N/A
406-734 Carter N/A
406-735 Geyser N/A
406-736 Stockett N/A
406-737 Geraldine N/A
406-738 Raynesford N/A
406-739 Loma N/A
406-740 Colstrip N/A
406-741 Hot Springs N/A
406-742 Fairview N/A
406-743 Laurel 9/8/2006
406-744 St Ignatius 11/16/2012
406-745 St Ignatius N/A
406-746 Nashua N/A
406-747 Fairview N/A
406-748 Colstrip N/A
406-749 Colstrip N/A
406-750 Great Falls 8/22/2005
406-751 Kalispell N/A
406-752 Kalispell N/A
406-753 Brady N/A
406-754 Condon N/A
406-755 Kalispell N/A
406-756 Kalispell N/A
406-757 Decker N/A
406-758 Kalispell N/A
406-759 Chester N/A
406-760 Great Falls N/A
406-761 Great Falls N/A
406-762 Opheim N/A
406-763 Gallatin Gateway N/A
406-764 North Frannie N/A
406-765 Plentywood N/A
406-766 Froid N/A
406-767 Ridge N/A
406-768 Poplar N/A
406-769 Bainville N/A
406-770 Great Falls N/A
406-771 Great Falls N/A
406-772 Plevna N/A
406-773 Richey N/A
406-774 Lambert N/A
406-775 Ekalaka N/A
406-776 Savage N/A
406-777 Stevensville N/A
406-778 Baker N/A
406-779 Flaxville Rural N/A
406-780 Columbus N/A
406-781 Great Falls N/A
406-782 Butte N/A
406-783 Scobey Rural N/A
406-784 Ashland N/A
406-785 North Nashua N/A
406-786 Brockton N/A
406-787 Culbertson N/A
406-788 Great Falls N/A
406-789 Medicine Lake N/A
406-790 Culbertson N/A
406-791 Great Falls N/A
406-792 Butte N/A
406-793 Ovando N/A
406-794 Billings 3/15/2006
406-795 Wibaux N/A
406-796 Wibaux N/A
406-797 Anaconda N/A
406-798 West Sidney N/A
406-799 Great Falls N/A
NPANXX Area served1 Date2
406-800 Bridger 12/11/2013
406-802 Hamilton N/A
406-804 Gardiner 8/20/2019
406-807 East Glacier Park 4/22/2021
406-808 Havre N/A
406-812 Laurel 10/3/2011
406-813 Belgrade 9/14/2011
406-815 Red Lodge N/A
406-818 Red Lodge N/A
406-820 Olney 10/11/2007
406-821 Darby N/A
406-822 Superior N/A
406-823 Livingston N/A
406-824 St Ignatius N/A
406-825 Clinton N/A
406-826 Plains N/A
406-827 Thompson Falls N/A
406-828 Alzada N/A
406-829 Missoula N/A
406-830 Missoula 2/6/2007
406-831 Billings 12/21/2016
406-832 Wise River N/A
406-833 Ronan N/A
406-834 Jackson N/A
406-835 Melrose N/A
406-836 Great Falls N/A
406-837 Bigfork N/A
406-838 Cooke City N/A
406-839 Billings 9/30/2006
406-840 Silvertip 5/23/2007
406-841 Helena N/A
406-842 Sheridan N/A
406-843 Virginia City N/A
406-844 Lakeside N/A
406-845 Cut Bank 10/27/2008
406-846 Deer Lodge N/A
406-847 Noxon N/A
406-848 Gardiner N/A
406-849 Elmo N/A
406-850 Billings N/A
406-851 Miles City N/A
406-852 Miles City N/A
406-853 Miles City N/A
406-854 Marion N/A
406-855 Billings N/A
406-856 Custer N/A
406-857 Somers N/A
406-858 Kalispell N/A
406-859 Philipsburg N/A
406-860 Billings N/A
406-861 Billings N/A
406-862 Whitefish N/A
406-863 Whitefish N/A
406-864 South Alberton N/A
406-865 Dillon N/A
406-866 Great Falls N/A
406-867 Billings N/A
406-868 Great Falls N/A
406-869 Billings N/A
406-870 Great Falls N/A
406-871 Kalispell 6/15/2006
406-872 Polson 10/15/2007
406-873 Cut Bank N/A
406-874 Miles City N/A
406-875 Pompeys Pillar N/A
406-876 Billings N/A
406-877 West Beach N/A
406-878 Great Falls 3/1/2013
406-879 Havre 11/11/2009
406-880 Missoula N/A
406-881 Olney N/A
406-882 Eureka Rural N/A
406-883 Polson N/A
406-884 Polson N/A
406-885 Kalispell N/A
406-886 Swan Lake N/A
406-887 Finley Point N/A
406-888 West Glacier N/A
406-889 Eureka Rural N/A
406-890 Kalispell N/A
406-891 Baker N/A
406-892 Columbia Falls N/A
406-893 Peerless N/A
406-894 Billings N/A
406-895 Outlook N/A
406-896 Billings N/A
406-897 Columbia Falls N/A
406-898 Bozeman 3/20/2009
406-899 Great Falls N/A

NPANXX Area served1 Date2
406-900 Ennis 9/29/2017
406-901 Billings 4/14/2021
406-902 Sheridan 11/27/2018
406-905 Joliet 10/3/2011
406-909 Columbia Falls 5/24/2018
406-913 Roundup N/A
406-914 Lambert N/A
406-915 South Wolf Point N/A
406-916 Helena 3/24/2017
406-919 Belgrade 3/4/2019
406-920 Bozeman N/A
406-922 Bozeman N/A
406-923 Great Falls 1/3/2005
406-924 Belgrade 10/26/2004
406-925 Dillon N/A
406-926 Missoula 1/7/2011
406-927 Billings 7/23/2010
406-928 Grass Range N/A
406-929 Hungry Horse 7/26/2007
406-930 Big Timber N/A
406-931 Big Timber N/A
406-932 Big Timber N/A
406-933 Helena N/A
406-934 Miles City N/A
406-935 Broadus N/A
406-936 Clyde Park 7/15/2015
406-937 Sunburst N/A
406-938 Alzada N/A
406-939 West Glendive N/A
406-940 Molt 7/18/2017
406-941 West Glendive N/A
406-942 Glasgow 10/23/2009
406-943 Sidney 1/9/2003
406-944 Miles City 1/9/2003
406-945 Havre N/A
406-946 Livingston 1/9/2003
406-947 Musselshell N/A
406-948 Glendive 1/9/2003
406-949 Townsend N/A
406-951 Miles City N/A
406-952 Great Falls N/A
406-953 Hardin N/A
406-954 Roy N/A
406-956 Baker 10/20/2010
406-957 Terry N/A
406-960 Dillon 1/9/2003
406-961 Hamilton N/A
406-962 Joliet N/A
406-963 Froid Rural N/A
406-964 Great Falls N/A
406-965 Great Falls N/A
406-966 Shelby 1/9/2003
406-967 Worden N/A
406-968 Lewistown 1/9/2003
406-969 Billings N/A
406-970 Billings 6/3/2016
406-971 Plevna N/A
406-972 West Camp Crook N/A
406-973 Sidney N/A
406-974 Circle N/A
406-975 Ekalaka N/A
406-977 Jordan N/A
406-978 Baker N/A
406-979 Richey N/A
406-980 Townsend N/A
406-981 South Miles City N/A
406-982 Yellow Bay N/A
406-983 Ashland N/A
406-984 Birney N/A
406-987 Glendive N/A
406-988 Dillon 1/7/2005
406-989 West Glendive N/A
406-990 Lame Deer 5/12/2020
406-991 Marion 10/11/2007
406-992 Helena 8/26/2008
406-993 Big Sky N/A
406-994 Bozeman N/A
406-995 Big Sky N/A
406-996 Helena 1/10/2011
406-998 Billings 8/26/2015
406-999 Big Sky 7/11/2006
  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 CO codes assigned before 2001.
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Cities in area code 406

City1 County Time2
Absarokee Stillwater M
Acton Yellowstone M
Alberton Mineral M
Alder Madison M
Alzada Carter M
Anaconda Deer Lodge M
Angela Rosebud M
Antelope Sheridan M
Arlee Lake M
Ashland Rosebud M
Augusta Lewis And Clark M
Avon Powell M
Babb Glacier M
Bainville Roosevelt M
Baker Fallon M
Ballantine Yellowstone M
Basin Jefferson M
Bearcreek Carbon M
Belfry Carbon M
Belgrade Gallatin M
Belt Cascade M
Biddle Powder River M
Big Arm Lake M
Big Sandy Chouteau M
Big Sky Gallatin M
Big Timber Sweet Grass M
Bigfork Flathead M
Bighorn Treasure M
Billings Yellowstone M
Birney Rosebud M
Black Eagle Cascade M
Bloomfield Dawson M
Bonner Missoula M
Boulder Jefferson M
Box Elder Hill M
Boyd Carbon M
Boyes Carter M
Bozeman Gallatin M
Brady Pondera M
Bridger Carbon M
Broadus Powder River M
Broadview Yellowstone M
Brockton Roosevelt M
Brockway McCone M
Browning Glacier M
Brusett Garfield M
Buffalo Fergus M
Busby Big Horn M
Butte Silver Bow M
Bynum Teton M
Cameron Madison M
Canyon Creek Lewis And Clark M
Capitol Carter M
Cardwell Jefferson M
Carter Chouteau M
Cascade Cascade M
Charlo Lake M
Chester Liberty M
Chinook Blaine M
Choteau Teton M
Circle McCone M
Clancy Jefferson M
Clinton Missoula M
Clyde Park Park M
Coffee Creek Fergus M
Cohagen Garfield M
Colstrip Rosebud M
Columbia Falls Flathead M
Columbus Stillwater M
Condon Missoula M
Conner Ravalli M
Conrad Pondera M
Cooke City Park M
Coram Flathead M
Corvallis Ravalli M
Crane Richland M
Crow Agency Big Horn M
Culbertson Roosevelt M
Custer Yellowstone M
Cut Bank Glacier M
Dagmar Sheridan M
Darby Ravalli M
Dayton Lake M
De Borgia Mineral M
Decker Big Horn M
Deer Lodge Powell M
Dell Beaverhead M
Denton Fergus M
Dillon Beaverhead M
Divide Silver Bow M
Dixon Sanders M
Dodson Phillips M
Drummond Granite M
Dupuyer Pondera M
Dutton Teton M
East Glacier Park Glacier M
East Helena Lewis And Clark M
Edgar Carbon M
Ekalaka Carter M
Elliston Powell M
Elmo Lake M
Emigrant Park M
Ennis Madison M
Essex Flathead M
Ethridge Toole M
Eureka Lincoln M
Fairfield Teton M
Fairview Richland M
Fallon Prairie M
Fishtail Stillwater M
Flaxville Daniels M
Florence Ravalli M
Floweree Chouteau M
Forestgrove Fergus M
Forsyth Rosebud M
Fort Benton Chouteau M
Fort Harrison Lewis And Clark M
Fort Peck Valley M
Fort Shaw Cascade M
Fortine Lincoln M
Frazer Valley M
Frenchtown Missoula M
Froid Roosevelt M
Fromberg Carbon M
Galata Toole M
Gallatin Gateway Gallatin M
Gardiner Park M
Garrison Powell M
Garryowen Big Horn M
Geraldine Chouteau M
Geyser Judith Basin M
Gildford Hill M
Glasgow Valley M
Glen Beaverhead M
Glendive Dawson M
Glentana Valley M
Gold Creek Powell M
Grantsdale Ravalli M
Grass Range Fergus M
Great Falls Cascade M
Greycliff Sweet Grass M
Hall Granite M
Hamilton Ravalli M
Hammond Carter M
Hardin Big Horn M
Harlem Blaine M
Harlowton Wheatland M
Harrison Madison M
Hathaway Rosebud M
Haugan Mineral M
Havre Hill M
Hays Blaine M
Heart Butte Pondera M
Helena Lewis And Clark M
Helmville Powell M
Heron Sanders M
Highwood Chouteau M
Hilger Fergus M
Hingham Hill M
Hinsdale Valley M
Hobson Judith Basin M
Hogeland Blaine M
Homestead Sheridan M
Hot Springs Sanders M
Hungry Horse Flathead M
Huntley Yellowstone M
Huson Missoula M
Hysham Treasure M
Ingomar Rosebud M
Inverness Hill M
Ismay Custer M
Jackson Beaverhead M
Jefferson City Jefferson M
Joliet Carbon M
Joplin Liberty M
Jordan Garfield M
Judith Gap Wheatland M
Kalispell Flathead M
Kevin Toole M
Kila Flathead M
Kinsey Custer M
Kremlin Hill M
Lake Mc Donald Flathead M
Lakeside Flathead M
Lambert Richland M
Lame Deer Rosebud M
Larslan Valley M
Laurel Yellowstone M
Lavina Golden Valley M
Ledger Pondera M
Lewistown Fergus M
Libby Lincoln M
Lima Beaverhead M
Lincoln Lewis And Clark M
Lindsay Dawson M
Livingston Park M
Lloyd Blaine M
Lodge Grass Big Horn M
Lolo Missoula M
Loma Chouteau M
Lonepine Sanders M
Loring Phillips M
Lothair Liberty M
Malmstrom Afb Cascade M
Malta Phillips M
Manhattan Gallatin M
Marion Flathead M
Martin City Flathead M
Martinsdale Meagher M
Marysville Lewis And Clark M
Mc Allister Madison M
Mc Leod Sweet Grass M
Medicine Lake Sheridan M
Melrose Silver Bow M
Melstone Musselshell M
Melville Sweet Grass M
Mildred Prairie M
Miles City Custer M
Milltown Missoula M
Missoula Missoula M
Moccasin Judith Basin M
Molt Yellowstone M
Monarch Cascade M
Moore Fergus M
Mosby Garfield M
Musselshell Musselshell M
Nashua Valley M
Neihart Cascade M
Norris Madison M
Noxon Sanders M
Nye Stillwater M
Oilmont Toole M
Olive Powder River M
Olney Flathead M
Opheim Valley M
Otter Powder River M
Outlook Sheridan M
Ovando Powell M
Pablo Lake M
Paradise Sanders M
Park City Stillwater M
Peerless Daniels M
Pendroy Teton M
Philipsburg Granite M
Pinesdale Ravalli M
Plains Sanders M
Plentywood Sheridan M
Plevna Fallon M
Polaris Beaverhead M
Polebridge Flathead M
Polson Lake M
Pompeys Pillar Yellowstone M
Pony Madison M
Poplar Roosevelt M
Powderville Powder River M
Power Teton M
Pray Park M
Proctor Lake M
Pryor Big Horn M
Radersburg Broadwater M
Ramsay Silver Bow M
Rapelje Stillwater M
Ravalli Lake M
Raymond Sheridan M
Raynesford Judith Basin M
Red Lodge Carbon M
Redstone Sheridan M
Reed Point Stillwater M
Reserve Sheridan M
Rexford Lincoln M
Richey Dawson M
Richland Valley M
Ringling Meagher M
Roberts Carbon M
Rollins Lake M
Ronan Lake M
Roscoe Carbon M
Rosebud Rosebud M
Roundup Musselshell M
Roy Fergus M
Rudyard Hill M
Ryegate Golden Valley M
Saco Phillips M
Saltese Mineral M
Sand Coulee Cascade M
Sand Springs Garfield M
Sanders Treasure M
Savage Richland M
Scobey Daniels M
Seeley Lake Missoula M
Shawmut Wheatland M
Shelby Toole M
Shepherd Yellowstone M
Sheridan Madison M
Sidney Richland M
Silver Gate Park M
Silver Star Madison M
Simms Cascade M
Somers Flathead M
Springdale Park M
St Ignatius Lake M
St Marie Valley M
St Regis Mineral M
St Xavier Big Horn M
Stanford Judith Basin M
Stevensville Ravalli M
Stockett Cascade M
Stryker Lincoln M
Sula Ravalli M
Sumatra Rosebud M
Sun River Cascade M
Sunburst Toole M
Superior Mineral M
Sweet Grass Toole M
Teigen Petroleum M
Terry Prairie M
Thompson Falls Sanders M
Three Forks Gallatin M
Toston Broadwater M
Townsend Broadwater M
Trego Lincoln M
Trout Creek Sanders M
Troy Lincoln M
Turner Blaine M
Twin Bridges Madison M
Two Dot Wheatland M
Ulm Cascade M
Valier Pondera M
Vandalia Valley M
Vaughn Cascade M
Victor Ravalli M
Vida McCone M
Virginia City Madison M
Volborg Custer M
Warm Springs Deer Lodge M
West Glacier Flathead M
West Yellowstone Gallatin M
Westby Sheridan M
White Sulphur Springs Meagher M
Whitefish Flathead M
Whitehall Jefferson M
Whitetail Daniels M
Whitewater Phillips M
Whitlash Liberty M
Wibaux Wibaux M
Willard Fallon M
Willow Creek Gallatin M
Wilsall Park M
Winifred Fergus M
Winnett Petroleum M
Winston Broadwater M
Wisdom Beaverhead M
Wise River Beaverhead M
Wolf Creek Lewis And Clark M
Wolf Point Roosevelt M
Worden Yellowstone M
Wyola Big Horn M
Yellowtail Big Horn M
Zortman Phillips M
Zurich Blaine M
  1. Listed above are most places served by area code 406. When multiple places in a state/province 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 02:33:22 PM).
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