# Area code 406

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Area_code_406
> Markdown URL: https://mediated.wiki/source/Area_code_406.md
> Source: https://en.wikipedia.org/wiki/Area_code_406
> Source revision: 1343023524
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Short description|Telephone area code for Montana, United States}}
{{Use American English|date=February 2026}}
<imagemap>
Image:Area_code_MT.png|right|thumb|Montana numbering plan area and area code (blue)
poly   67 33 0 20 1 1 51 0 58 24   [Area code 250](/source/Area_code_250)
poly   66 33 57 25 52 0 198 0 198 54   [Area code 403](/source/Area_code_403)
poly   198 55 198 0 419 0 418 72 265 63   [Area code 306](/source/Area_code_306)
poly   373 71 419 71 419 212 364 210   [Area code 701](/source/Area_code_701)
poly   364 212 363 267 419 267 419 212   [Area code 605](/source/Area_code_605)
poly   140 233 133 268 363 269 362 255   [Area code 307](/source/Area_code_307)
poly   1 21 15 23 6 70 12 85 12 99 37 137 47 141 36 165 39 178 31 179 32 187 35 195 51 188 58 216 65 222 60 221 61 230 71 230 71 248 77 254 79 247 92 253 93 246 110 250 121 250 125 243 130 256 135 259 134 268 1 267   [Area codes 208 and 986](/source/Area_codes_208_and_986)
desc top-right
</imagemap>

'''Area code 406''' is the telephone [area code](/source/area_code) in the [North American Numbering Plan](/source/North_American_Numbering_Plan) for the entire [U.S. state](/source/U.S._state) of [Montana](/source/Montana). It has been Montana's only area code since the [American Telephone and Telegraph Company](/source/American_Telephone_and_Telegraph_Company) created a nationwide [telephone numbering plan](/source/telephone_numbering_plan) in 1947.

As of 2013, 47 carriers served 1.7&nbsp;million lines in Montana. All but two wireline providers support [local number portability](/source/local_number_portability) (the exceptions are small rural independents Hot Springs Telephone Company and Northern Telephone Cooperative). Sufficient available codes for new exchanges in the 406 area code exist to meet anticipated demand until 2031; [number pooling](/source/number_pooling) has been implemented in response to increased demand and inefficient use of 406 numbering resources.<ref>{{cite web |last1=Inbody |first1=Kristen |title=In Montana, it's 406 exclusively until 2031 |url=https://www.greatfallstribune.com/story/news/2017/11/27/406-area-code-in-montana-extended/898459001/ |website=Great Falls Tribune |publisher=www.greatfallstribune.com |access-date=13 June 2023 |ref="In Montana, it's 406 exclusively until 2031" |date=27 Nov 2017}}</ref><ref>{{cite web|url=http://www.fcc.gov/document/montana-psc-granted-authority-implement-mandatory-number-pooling|title=Montana PSC Granted Authority to Implement Mandatory Number Pooling|date=12 December 2015|website=fcc.gov|access-date=7 May 2018|url-status=live|archive-url=https://web.archive.org/web/20171210160211/https://www.fcc.gov/document/montana-psc-granted-authority-implement-mandatory-number-pooling|archive-date=10 December 2017}}</ref>

Prior to October 2021, area code 406 had telephone numbers assigned for the [central office code](/source/central_office_code) 988. In 2020, ''988'' was designated nationwide as a dialing code for the [National Suicide Prevention Lifeline](/source/National_Suicide_Prevention_Lifeline), which created a conflict for exchanges that permit [seven-digit dialing](/source/seven-digit_dialing). This area code was therefore scheduled to transition to [ten-digit dialing](/source/ten-digit_dialing) by October 24, 2021.<ref name="pl556">{{cite web|url=https://nationalnanpa.com/pdf/PL_556.pdf|date=January 8, 2021|publisher=North American Numbering Plan Administrator |title=Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline)|access-date=March 9, 2021}}</ref>

For many Montanans, area code 406 has become an unofficial [symbol of the state](/source/List_of_Montana_state_symbols).<ref>{{cite web |last1=Stetz |first1=Mike |title=406, more than just an area code |url=https://www.montanarightnow.com/helena/406-more-than-just-an-area-code/article_20dc2d9c-e7ca-11e9-b7db-8b45e61949a8.html |website=NonStop Local |date=5 October 2019 |publisher=ABC FOX |access-date=17 March 2025}}</ref> Some Montanans celebrate April 6 as "406 Day," an unofficial holiday celebrating the state.<ref>{{cite web |last1=Juneau |first1=Brianna |title=Celebrating Montana on '406 Day' |url=https://www.krtv.com/news/montana-and-regional-news/montana-is-celebrated-on-406-day |website=3KRTV |date=7 April 2023 |publisher=Scripps Media Inc. |access-date=17 March 2025}}</ref>

==Central office codes of communities==
Within the Montana numbering plan area, the following communities are served by the listed [central office code](/source/central_office_code)s:
* [Absarokee](/source/Absarokee%2C_Montana): 328, 985
* [Alberton](/source/Alberton%2C_Montana): 722
* [Alta](/source/Darby%2C_Montana): 349
* [Alzada](/source/Alzada%2C_Montana): 828, 938
* [Anaconda](/source/Anaconda%2C_Montana): 559, 560, 563, 691, 797
* [Arlee](/source/Arlee%2C_Montana): 726
* [Ashland](/source/Ashland%2C_Montana): 784, 983
* [Augusta](/source/Augusta%2C_Montana): 562
* [Avon](/source/Avon%2C_Montana): 492
* [Bainville](/source/Bainville%2C_Montana): 769
* [Baker](/source/Baker%2C_Montana): 778, 891, 956, 978
* [Belfry](/source/Belfry%2C_Montana): 664
* [Belgrade](/source/Belgrade%2C_Montana): 388, 813, 924
* [Belt](/source/Belt%2C_Montana): 277
* [Bigfork](/source/Bigfork%2C_Montana): 420, 837
* [Big Sandy](/source/Big_Sandy%2C_Montana): 378
* [Big Sky](/source/Big_Sky%2C_Montana): 993, 995, 999
* [Big Timber](/source/Big_Timber%2C_Montana): 930, 931, 932, 936
* [Billings](/source/Billings%2C_Montana): 200, 206, 208, 237, 238, 245, 247, 248, 252, 254, 255, 256, 259, 272, 281, 294, 318, 325, 371, 373, 384, 435, 500, 534, 545, 591, 598, 601, 606, 620, 647, 651, 652, 655, 656, 657, 661, 670, 671, 672, 690, 694, 696, 697, 698, 702, 794, 839, 850, 855, 860, 861, 867, 869, 876, 894, 896, 927, 969
* [Birney](/source/Birney%2C_Montana): 984
* [Bloomfield](/source/Bloomfield%2C_Montana): 583
* [Boulder](/source/Boulder%2C_Montana): 225, 313
* [Box Elder](/source/Box_Elder%2C_Montana): 352
* [Bozeman](/source/Bozeman%2C_Montana): 209, 219, 312, 404, 414, 451, 522, 539, 548, 551, 556, 570, 577, 579, 580, 581, 582, 585, 586, 587, 589, 595, 599, 600, 602, 624, 898, 916, 920, 922, 994
* [Brady](/source/Brady%2C_Montana): 753
* [Bridger](/source/Bridger%2C_Montana): 662, 800
* [Broadus](/source/Broadus%2C_Montana): 436, 935
* [Broadview](/source/Broadview%2C_Montana): 667
* [Brockton](/source/Brockton%2C_Montana): 786
* [Browning](/source/Browning%2C_Montana): 338, 573
* [Busby](/source/Busby%2C_Montana): 592
* [Butte](/source/Butte%2C_Montana): 221, 299, 310, 479, 490, 491, 494, 496, 497, 498, 533, 565, 593, 723, 782, 792
* [Canyon Creek](/source/Canyon_Creek%2C_Montana): 368
* [Carlyle](/source/Carlyle%2C_Montana): 588
* [Carter](/source/Carter%2C_Montana): 734
* [Cascade](/source/Cascade%2C_Montana): 468
* [Charlo](/source/Charlo%2C_Montana): 644
* [Chester](/source/Chester%2C_Montana): 759
* [Chinook](/source/Chinook%2C_Montana): 357
* [Choteau](/source/Choteau%2C_Montana): 466
* [Circle](/source/Circle%2C_Montana): 485, 974
* [Clinton](/source/Clinton%2C_Montana): 330, 825
* [Clyde Park](/source/Clyde_Park%2C_Montana): 686
* [Colstrip](/source/Colstrip%2C_Montana): 213, 720, 740, 748, 749
* [Columbia Falls](/source/Columbia_Falls%2C_Montana): 892, 897
* [Columbus](/source/Columbus%2C_Montana): 290, 298, 321, 322, 780
* [Condon](/source/Condon%2C_Montana): 754
* [Conrad](/source/Conrad%2C_Montana): 271, 278, 289, 505, 576
* [Cooke City](/source/Cooke_City%2C_Montana): 838
* [Crooked Creek](/source/Crooked_Creek%2C_Montana): 484
* [Culbertson](/source/Culbertson%2C_Montana): 514, 787, 790
* [Custer](/source/Custer%2C_Montana): 856
* [Cut Bank](/source/Cut_Bank%2C_Montana): 229, 391, 845, 873
* [Dagmar](/source/Dagmar%2C_Montana): 483
* [Darby](/source/Darby%2C_Montana): 821
* [Decker](/source/Decker%2C_Montana): 757
* [Deer Lodge](/source/Deer_Lodge%2C_Montana): 415, 645, 846
* [Denton](/source/Denton%2C_Montana): 567
* [Devon](/source/Devon%2C_Montana): 432
* [Dillon](/source/Dillon%2C_Montana): 596, 660, 683, 865, 925, 960, 988
* [Divide](/source/Divide%2C_Montana): 267, 553
* [Sčilíp](/source/Dixon%2C_Montana): 246
* [Dodson](/source/Dodson%2C_Montana): 383
* [Drummond](/source/Drummond%2C_Montana): 288
* [Dupuyer](/source/Dupuyer%2C_Montana): 472
* [Dutton](/source/Dutton%2C_Montana): 476
* East [Conrad](/source/Conrad%2C_Montana): 627
* [East Glacier Park](/source/East_Glacier_Park%2C_Montana): 226
* [Ekalaka](/source/Ekalaka%2C_Montana): 775, 975
* [Elmo](/source/Elmo%2C_Montana): 631, 849
* [Ennis](/source/Ennis%2C_Montana): 682
* [Ethridge](/source/Ethridge%2C_Montana): 339
* [Eureka](/source/Eureka%2C_Montana): 296
* [Eureka](/source/Eureka%2C_Montana) rural: 297, 882, 889
* [Fairfield](/source/Fairfield%2C_Montana): 467
* [Fairview](/source/Fairview%2C_Montana): 742, 747
* [Fallon](/source/Fallon%2C_Montana): 486
* [Finley Point](/source/Finley_Point%2C_Montana): 571, 887
* [Flaxville](/source/Flaxville%2C_Montana): 474
* [Flaxville](/source/Flaxville%2C_Montana) rural: 779
* [Forsyth](/source/Forsyth%2C_Montana): 201, 346, 351, 356, 729
* [Fort Benton](/source/Fort_Benton%2C_Montana): 621, 622
* [Fort Peck](/source/Fort_Peck%2C_Montana): 526
* [Fort Shaw](/source/Fort_Shaw%2C_Montana): 264
* [Fort Smith](/source/Fort_Smith%2C_Montana): 666
* [Frazer](/source/Frazer%2C_Montana): 695
* [Frenchtown](/source/Frenchtown%2C_Montana): 508, 626
* [Froid](/source/Froid%2C_Montana): 766
* [Froid](/source/Froid%2C_Montana) rural: 963
* [Fromberg](/source/Fromberg%2C_Montana): 668
* [Gallatin Gateway](/source/Gallatin_Gateway%2C_Montana): 518, 763
* [Gardiner](/source/Gardiner%2C_Montana): 848
* [Geraldine](/source/Geraldine%2C_Montana): 737
* [Geyser](/source/Geyser%2C_Montana): 735
* [Gildford](/source/Gildford%2C_Montana): 376
* [Glasgow](/source/Glasgow%2C_Montana): 228, 230, 263, 831, 942
* [Glendive](/source/Glendive%2C_Montana): 345, 359, 365, 377, 948, 987
* [Glentana](/source/Glentana%2C_Montana): 724
* [Grant](/source/Grant%2C_Montana): 681
* [Grass Range](/source/Grass_Range%2C_Montana): 428, 928
* [Great Falls](/source/Great_Falls%2C_Montana): 205, 216, 217, 231, 268, 315, 403, 452, 453, 454, 455, 564, 590, 604, 727, 731, 750, 760, 761, 770, 771, 781, 788, 791, 799, 836, 866, 868, 870, 878, 899, 923, 952, 964, 965
* [Hamilton](/source/Hamilton%2C_Montana): 360, 361, 363, 369, 375, 381, 802, 961
* [Hardin](/source/Hardin%2C_Montana): 623, 629, 638, 665, 679, 699, 953
* [Harlem](/source/Harlem%2C_Montana): 353
* [Harlowton](/source/Harlowton%2C_Montana): 632
* [Harrison](/source/Harrison%2C_Montana): 685
* [Haugan](/source/Haugan%2C_Montana): 678
* [Havre](/source/Havre%2C_Montana): 262, 265, 808, 879, 945
* [Hays](/source/Hays%2C_Montana): 673
* [Helena](/source/Helena%2C_Montana): 202, 204, 227, 324, 389, 410, 417, 422, 430, 431, 437, 438, 439, 440, 441, 442, 443, 444, 447, 449, 457, 458, 459, 461, 465, 475, 495, 502, 513, 555, 558, 594, 603, 634, 841, 933, 992, 996
* [Highwood](/source/Highwood%2C_Montana): 733
* [Hingham](/source/Hingham%2C_Montana): 397
* [Hinsdale](/source/Hinsdale%2C_Montana): 364
* [Hobson](/source/Hobson%2C_Montana): 423
* [Hopp Illiad](/source/Hopp-Illiad%2C_Montana): 386
* [Hot Springs](/source/Hot_Springs%2C_Montana): 741
* [Hungry Horse](/source/Hungry_Horse%2C_Montana): 387, 929
* [Huntley](/source/Huntley%2C_Montana): 348
* [Hysham](/source/Hysham%2C_Montana): 342
* [Jackson](/source/Jackson%2C_Montana): 834
* [Joliet](/source/Joliet%2C_Montana): 905, 962
* [Joplin](/source/Joplin%2C_Montana): 292
* [Jordan](/source/Jordan%2C_Montana): 557, 977
* [Judith Gap](/source/Judith_Gap%2C_Montana): 473
* [Kalispell](/source/Kalispell%2C_Montana): 212, 249, 250, 253, 257, 260, 261, 270, 300, 309, 314, 407, 471, 607, 751, 752, 755, 756, 758, 858, 871, 885, 890
* [Kevin-Oilmont](/source/Kevin%2C_Montana): 337
* [Kremlin](/source/Kremlin%2C_Montana): 372
* [Lakeside](/source/Lakeside%2C_Montana): 709, 844
* [Lambert](/source/Lambert%2C_Montana): 774, 914
* [Lame Deer](/source/Lame_Deer%2C_Montana): 477
* [Larslan](/source/Larslan%2C_Montana): 725
* [Laurel](/source/Laurel%2C_Montana): 530, 628, 633, 743, 812
* [Lavina](/source/Lavina%2C_Montana): 636
* [Lewistown](/source/Lewistown%2C_Montana): 350, 366, 380, 535, 538, 707, 708, 968
* [Libby](/source/Libby%2C_Montana): 283, 291, 293, 334, 400
* [Lima](/source/Lima%2C_Montana): 276, 340
* [Lincoln](/source/Lincoln%2C_Montana): 362
* [Lindsay](/source/Lindsay%2C_Montana): 584
* [Livingston](/source/Livingston%2C_Montana): 220, 222, 223, 224, 333, 823, 946
* [Lodge Grass](/source/Lodge_Grass%2C_Montana): 639
* [Loma](/source/Loma%2C_Montana): 739
* [Malta](/source/Malta%2C_Montana): 301, 654, 680
* [Manhattan](/source/Manhattan%2C_Montana): 282, 284
* [Marion](/source/Marion%2C_Montana): 854, 991
* [Martinsdale](/source/Martinsdale%2C_Montana): 572
* [Medicine Lake](/source/Medicine_Lake%2C_Montana): 789
* [Melrose](/source/Melrose%2C_Montana): 835
* [Melstone](/source/Melstone%2C_Montana): 358
* [Melville](/source/Melville%2C_Montana): 537
* [Miles City](/source/Miles_City%2C_Montana): 232, 233, 234, 851, 852, 853, 874, 934, 944, 951
* [Missoula](/source/Missoula%2C_Montana): 203, 207, 214, 215, 218, 239, 240, 241, 243, 251, 258, 273, 274, 303, 317, 327, 329, 370, 396, 493, 523, 529, 531, 532, 540, 541, 542, 543, 544, 546, 549, 550, 552, 721, 728, 829, 830, 880, 926
* [Molt](/source/Molt%2C_Montana): 669
* [Moore](/source/Moore%2C_Montana): 374
* [Musselshell](/source/Musselshell%2C_Montana): 947
* [Nashua](/source/Nashua%2C_Montana): 746
* [Neihart](/source/Neihart%2C_Montana): 236
* [North Broadus](/source/Broadus%2C_Montana): 554
* [North Cut Bank](/source/Cut_Bank%2C_Montana): 336
* [North Frannie](/source/Frannie%2C_Wyoming): 764
* [North Glasgow](/source/Glasgow%2C_Montana): 367
* [North Hinsdale](/source/Hinsdale%2C_Montana): 648
* [North Nashua](/source/Nashua%2C_Montana): 785
* [North Parkman](/source/Sheridan%2C_Wyoming): 643, 659<ref>North Parkman is served from wire centre [http://www.localcallingguide.com/lca_prefix.php?switch=DNRHWYMARS1 DNRHWYMARS1] {{webarchive|url=https://web.archive.org/web/20141019030017/http://www.localcallingguide.com/lca_prefix.php?switch=DNRHWYMARS1 |date=2014-10-19 }} in Sheridan, WY</ref>
* [North Poplar](/source/Poplar%2C_Montana): 448
* [North Havre](/source/Havre%2C_Montana): 394, 398
* [North Ryegate](/source/Ryegate%2C_Montana): 575
* [North Wolf Point](/source/Wolf_Point%2C_Montana): 392
* [Noxon](/source/Noxon%2C_Montana): 847
* [Olney](/source/Olney%2C_Montana): 820, 881
* [Opheim](/source/Opheim%2C_Montana): 762
* [Outlook](/source/Outlook%2C_Montana): 895
* [Ovando](/source/Ovando%2C_Montana): 793
* [Pablo](/source/Pablo%2C_Montana): 275, 332, 675
* [Peerless](/source/Peerless%2C_Montana): 893
* [Pendroy](/source/Pendroy%2C_Montana): 469
* [Philipsburg](/source/Philipsburg%2C_Montana): 859
* [Plains](/source/Plains%2C_Montana): 826
* [Plentywood](/source/Plentywood%2C_Montana): 765
* [Plevna](/source/Plevna%2C_Montana): 772, 971
* [Polson](/source/Polson%2C_Montana): 319, 872, 883, 884
* [Pompey's Pillar](/source/Pompey's_Pillar%2C_Montana): 875
* [Poplar](/source/Poplar%2C_Montana): 768
* [Potomac](/source/Potomac%2C_Montana): 244
* [Power](/source/Power%2C_Montana): 463
* [Rapelje](/source/Rapelje%2C_Montana): 663
* [Raynesford](/source/Raynesford%2C_Montana): 738
* [Red Lodge](/source/Red_Lodge%2C_Montana): 425, 426, 445, 446, 818
* [Reed Point](/source/Reed_Point%2C_Montana): 326
* [Reserve](/source/Reserve%2C_Montana): 286
* [Richey](/source/Richey%2C_Montana): 773, 979
* [Ridge](/source/Ridge%2C_Montana): 767
* [Rock Springs](/source/Rock_Springs%2C_Montana): 354
* [Ronan](/source/Ronan%2C_Montana): 528, 676, 833
* [Rosebud](/source/Rosebud%2C_Montana): 347
* [Roundup](/source/Roundup%2C_Montana): 320, 323, 331, 913
* [Roy](/source/Roy%2C_Montana): 464, 954
* [Rudyard](/source/Rudyard%2C_Montana): 355
* [Ryegate](/source/Ryegate%2C_Montana): 568
* [Saco](/source/Saco%2C_Montana): 527
* [Saint Ignatius](/source/Saint_Ignatius%2C_Montana): 744, 745, 824
* [Saint Mary](/source/Saint_Mary%2C_Montana): 732
* [Savage](/source/Savage%2C_Montana): 776
* [Scobey](/source/Scobey%2C_Montana): 487, 688
* [Scobey](/source/Scobey%2C_Montana) rural: 783
* [Seeley Lake](/source/Seeley_Lake%2C_Montana): 210, 499, 677
* [Shelby](/source/Shelby%2C_Montana): 424, 434, 450, 460, 470, 597, 966
* [Sheridan](/source/Sheridan%2C_Montana): 842
* [Sidney](/source/Sidney%2C_Montana): 433, 478, 480, 482, 488, 489, 630, 943, 973
* [Silvertip](/source/Powell%2C_Wyoming): 574, 840<ref>Silvertip is served from [http://www.localcallingguide.com/lca_prefix.php?switch=POWLWYMARS1 POWLWYMARS1] {{webarchive|url=https://web.archive.org/web/20141019030021/http://www.localcallingguide.com/lca_prefix.php?switch=POWLWYMARS1 |date=2014-10-19 }} Powell, WY</ref>
* [Somers](/source/Somers%2C_Montana): 393, 857
* [South Alberton](/source/Alberton%2C_Montana): 864
* [South Broadus](/source/Broadus%2C_Montana): 427
* [South Chester](/source/Chester%2C_Montana): 456
* [South Miles City](/source/Miles_City%2C_Montana): 421, 981
* [South Havre](/source/Havre%2C_Montana): 390, 395, 399
* [South Malta](/source/Malta%2C_Montana): 658
* [South Wolf Point](/source/Wolf_Point%2C_Montana): 525, 915
* [Stanford](/source/Stanford%2C_Montana): 566
* [Stevensville](/source/Stevensville%2C_Montana): 625, 777
* [Stockett](/source/Stockett%2C_Montana): 736
* [Saint Regis](/source/Saint_Regis%2C_Montana): 269, 280, 649
* [Sunburst](/source/Sunburst%2C_Montana): 561, 937
* [Superior](/source/Superior%2C_Montana): 382, 515, 822
* [Swan Lake](/source/Swan_Lake%2C_Montana): 612, 886
* [Sweetgrass](/source/Sweetgrass%2C_Montana): 335
* [Terry](/source/Terry%2C_Montana): 635, 637, 957
* [Thompson Falls](/source/Thompson_Falls%2C_Montana): 242, 615, 827
* [Three Forks](/source/Three_Forks%2C_Montana): 285, 616
* [Townsend](/source/Townsend%2C_Montana): 266, 521, 949, 980
* [Troy](/source/Troy%2C_Montana): 295
* [Turner](/source/Turner%2C_Montana): 379
* [Twin Bridges](/source/Twin_Bridges%2C_Montana): 684
* [Valier](/source/Valier%2C_Montana): 279
* [Victor](/source/Victor%2C_Montana): 642
* [Virginia City](/source/Virginia_City%2C_Montana): 843
* [Valley Industrial Park](/source/St._Marie%2C_Montana): 524
* [Warm Springs](/source/Warm_Springs%2C_Montana): 693
* [West Beach](/source/Beach%2C_North_Dakota): 877<ref>West Beach is served from [http://www.localcallingguide.com/lca_prefix.php?switch=BECHNDXADS1 BECHNDXADS1] {{webarchive|url=https://web.archive.org/web/20141019030110/http://www.localcallingguide.com/lca_prefix.php?switch=BECHNDXADS1 |date=2014-10-19 }} in Beach, ND</ref>
* [Westby](/source/Westby%2C_Montana): 385
* [West Camp Crook](/source/Camp_Crook%2C_South_Dakota): 972<ref>West Camp Crook is served from [http://www.localcallingguide.com/lca_prefix.php?switch=CMCRSDXARL0 CMCRSDXARL0] {{webarchive|url=https://web.archive.org/web/20141019030108/http://www.localcallingguide.com/lca_prefix.php?switch=CMCRSDXARL0 |date=2014-10-19 }} in Camp Crook, SD</ref>
* [West Glacier](/source/West_Glacier%2C_Montana): 888
* [West Glendive](/source/West_Glendive%2C_Montana): 687, 939, 941, 989
* [West Sidney](/source/Sidney%2C_Montana): 798
* [West Squaw Gap](/source/Squaw_Gap%2C_North_Dakota): 569<ref>West Squaw Gap is served from [http://www.localcallingguide.com/lca_prefix.php?switch=SQGPNDXARS5 SQGPNDXARS5] {{webarchive|url=https://web.archive.org/web/20141019030112/http://www.localcallingguide.com/lca_prefix.php?switch=SQGPNDXARS5 |date=2014-10-19 }} Squaw Gap, ND</ref>
* [West Yellowstone](/source/West_Yellowstone%2C_Montana): 640, 641, 646
* [Whitefish](/source/Whitefish%2C_Montana): 730, 862, 863
* [Whitehall](/source/Whitehall%2C_Montana): 287
* [Whitewater](/source/Whitewater%2C_Montana): 674
* [White Sulphur Springs](/source/White_Sulphur_Springs%2C_Montana): 305, 547
* [Wibaux](/source/Wibaux%2C_Montana): 795, 796
* [Wilsall](/source/Wilsall%2C_Montana): 578
* [Winifred](/source/Winifred%2C_Montana): 462
* [Winnett](/source/Winnett%2C_Montana): 429
* [Wisdom](/source/Wisdom%2C_Montana): 689
* [Wise River](/source/Wise_River%2C_Montana): 832
* [Wolf Creek](/source/Wolf_Creek%2C_Montana): 235, 302
* [Wolf Point](/source/Wolf_Point%2C_Montana): 650, 653
* [Worden](/source/Worden%2C_Montana): 967
* [Wyola](/source/Wyola%2C_Montana): 343
* [Yellow Bay](/source/Yellow_Bay%2C_Montana): 692, 982
* Premium numbers: (1-406) 976

==See also==
*[List of North American Numbering Plan area code](/source/List_of_North_American_Numbering_Plan_area_codes)

==References==
<references/>

==External links==
{{Area code footer|Map=MT}}

{{Area code box| State = MT
| Width=40%
| This = 406
| N = [236/672/778](/source/area_codes_778%2C_236%2C_and_672), [250](/source/area_code_250), [306](/source/area_code_306), [403](/source/area_code_403), [587/825/368](/source/Area_codes_587%2C_825%2C_and_368), [639](/source/area_code_639)
| S = [307](/source/area_code_307)
| E = [605](/source/area_code_605), [701](/source/area_code_701)
| W = [208/986](/source/area_codes_208_and_986)
| S1 = AB | S2 = BC | S3 = SK | S4 = ID | S5 = ND | S6 = SD | S7 = WY
}}

{{Area code list}}

406
406
Category:Telecommunications-related introductions in 1947
Category:1947 establishments in Montana

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Adapted from the Wikipedia article [Area code 406](https://en.wikipedia.org/wiki/Area_code_406) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Area_code_406?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.