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Area Code 406

Area code 406 is in Montana, USA , spanning 56 counties and serving 360 cities, including Billings, Missoula or Great Falls; it currently uses 751 prefixes, assigned from 406-200-XXXX through 406-999-XXXX.

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

The current local time is .

406 area code location on a map
© OpenStreetMap contributors
For exact NPA boundaries see official 406 area code map

Phone number lookup

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Locate any 406-NXX prefix:

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
406-406 Missoula 12/09/2024
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
406-517 Livingston 06/07/2024
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
406-536 Bozeman 12/18/2024
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
406-610 Missoula 01/06/2025
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
406-617 Billings 12/23/2024
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
406-955 Kalispell 12/04/2023
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
406-997 Fromberg 01/24/2024
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 central office codes assigned before 2001.
  3. NXX prefixes last updated: March 1st, 2025

Cities in area code 406

City1 County Time Zone2
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 USA area code 406. 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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