Image:Area_code_MT.png, Montana numbering plan area and area code (blue)
poly 67 33 0 20 1 1 51 0 58 24 Area code 250
poly 66 33 57 25 52 0 198 0 198 54 Area code 403
poly 198 55 198 0 419 0 418 72 265 63 Area code 306
poly 373 71 419 71 419 212 364 210 Area code 701
image:Area_code_ND.png, North Dakota numbering plan area and area code, with border states and provinces)
poly 0 0 106 0 106 36 0 30 Area code 306
poly 109 1 107 34 239 35 298 32 297 0 Area code 204
poly 241 36 298 33 300 144 296 142 284 ...
poly 364 212 363 267 419 267 419 212 Area code 605
poly 140 233 133 268 363 269 362 255 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
desc top-right
Area code 406 is the telephone
area code in the
North American Numbering Plan
The North American Numbering Plan (NANP) is an integrated telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1, World Numbering Zone ...
for the entire
U.S. state of
Montana. It has been Montana's only area code since the
American Telephone and Telegraph Company created a nationwide
telephone numbering plan in 1947.
As of 2013, 47 carriers served 1.7 million lines in Montana. All but two wireline providers support
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 has been implemented in response to increased demand and inefficient use of 406 numbering resources.
Prior to October 2021, area code 406 had telephone numbers assigned for the
central office code 988. In 2020, ''988'' was designated nationwide as a dialing code for the
National Suicide Prevention Lifeline, which created a conflict for exchanges that permit
seven-digit dialing. This area code was therefore scheduled to transition to
ten-digit dialing by October 24, 2021.
For many Montanans, area code 406 has become an unofficial
symbol of the state. Some Montanans celebrate April 6 as "406 Day," an unofficial holiday celebrating the state.
Central office codes of communities
Within the Montana numbering plan area, the following communities are served by the listed
central office codes:
*
Absarokee: 328, 985
*
Alberton: 722
*
Alta: 349
*
Alzada: 828, 938
*
Anaconda: 559, 560, 563, 691, 797
*
Arlee: 726
*
Ashland: 784, 983
*
Augusta: 562
*
Avon: 492
*
Bainville: 769
*
Baker: 778, 891, 956, 978
*
Belfry: 664
*
Belgrade
Belgrade is the Capital city, capital and List of cities in Serbia, largest city of Serbia. It is located at the confluence of the Sava and Danube rivers and at the crossroads of the Pannonian Basin, Pannonian Plain and the Balkan Peninsula. T ...
: 388, 813, 924
*
Belt: 277
*
Bigfork: 420, 837
*
Big Sandy: 378
*
Big Sky: 993, 995, 999
*
Big Timber: 930, 931, 932, 936
*
Billings: 200, 206, 208, 237, 238, 245, 247, 248, 252, 254, 255, 256, 259, 272, 281, 294, 318, 325, 371, 373, 384, 435, 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: 984
*
Bloomfield: 583
*
Boulder: 225, 313
*
Box Elder: 352
*
Bozeman: 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: 753
*
Bridger: 662, 800
*
Broadus: 436, 935
*
Broadview: 667
*
Brockton: 786
*
Browning: 338, 573
*
Busby: 592
*
Butte
In geomorphology, a butte ( ) is an isolated hill with steep, often vertical sides and a small, relatively flat top; buttes are smaller landforms than mesas, plateaus, and table (landform), tablelands. The word ''butte'' comes from the French l ...
: 221, 299, 310, 479, 490, 491, 494, 496, 497, 498, 533, 565, 593, 723, 782, 792
*
Canyon Creek: 368
*
Carlyle: 588
*
Carter: 734
*
Cascade: 468
*
Charlo: 644
*
Chester: 759
*
Chinook: 357
*
Choteau: 466
*
Circle
A circle is a shape consisting of all point (geometry), points in a plane (mathematics), plane that are at a given distance from a given point, the Centre (geometry), centre. The distance between any point of the circle and the centre is cal ...
: 485, 974
*
Clinton: 330, 825
*
Clyde Park: 686
*
Colstrip: 213, 720, 740, 748, 749
*
Columbia Falls: 892, 897
*
Columbus: 290, 298, 321, 322, 780
*
Condon: 754
*
Conrad: 271, 278, 289, 505, 576
*
Cooke City: 838
*
Crooked Creek: 484
*
Culbertson: 514, 787, 790
*
Custer: 856
*
Cut Bank: 229, 391, 845, 873
*
Dagmar: 483
*
Darby: 821
*
Decker: 757
*
Deer Lodge: 415, 645, 846
*
Denton: 567
*
Devon
Devon ( ; historically also known as Devonshire , ) is a ceremonial county in South West England. It is bordered by the Bristol Channel to the north, Somerset and Dorset to the east, the English Channel to the south, and Cornwall to the west ...
: 432
*
Dillon: 596, 660, 683, 865, 925, 960, 988
*
Divide: 267, 553
*
Sčilíp: 246
*
Dodson: 383
*
Drummond: 288
*
Dupuyer: 472
*
Dutton: 476
* East
Conrad: 627
*
East Glacier Park: 226
*
Ekalaka: 775, 975
*
Elmo: 631, 849
*
Ennis: 682
*
Ethridge: 339
*
Eureka: 296
*
Eureka rural: 297, 882, 889
*
Fairfield: 467
*
Fairview: 742, 747
*
Fallon: 486
*
Finley Point: 571, 887
*
Flaxville: 474
*
Flaxville rural: 779
*
Forsyth: 201, 346, 351, 356, 729
*
Fort Benton: 621, 622
*
Fort Peck: 526
*
Fort Shaw: 264
*
Fort Smith: 666
*
Frazer: 695
*
Frenchtown: 508, 626
*
Froid: 766
*
Froid rural: 963
*
Fromberg: 668
*
Gallatin Gateway: 518, 763
*
Gardiner: 848
*
Geraldine: 737
*
Geyser: 735
*
Gildford: 376
*
Glasgow
Glasgow is the Cities of Scotland, most populous city in Scotland, located on the banks of the River Clyde in Strathclyde, west central Scotland. It is the List of cities in the United Kingdom, third-most-populous city in the United Kingdom ...
: 228, 230, 263, 831, 942
*
Glendive: 345, 359, 365, 377, 948, 987
*
Glentana: 724
*
Grant: 681
*
Grass Range: 428, 928
*
Great Falls: 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: 360, 361, 363, 369, 375, 381, 802, 961
*
Hardin: 623, 629, 638, 665, 679, 699, 953
*
Harlem: 353
*
Harlowton: 632
*
Harrison: 685
*
Haugan: 678
*
Havre: 262, 265, 808, 879, 945
*
Hays: 673
*
Helena: 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: 733
*
Hingham: 397
*
Hinsdale: 364
*
Hobson: 423
*
Hopp Illiad: 386
*
Hot Springs: 741
*
Hungry Horse: 387, 929
*
Huntley: 348
*
Hysham: 342
*
Jackson: 834
*
Joliet: 905, 962
*
Joplin: 292
*
Jordan
Jordan, officially the Hashemite Kingdom of Jordan, is a country in the Southern Levant region of West Asia. Jordan is bordered by Syria to the north, Iraq to the east, Saudi Arabia to the south, and Israel and the occupied Palestinian ter ...
: 557, 977
*
Judith Gap: 473
*
Kalispell: 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: 337
*
Kremlin: 372
*
Lakeside: 709, 844
*
Lambert: 774, 914
*
Lame Deer: 477
*
Larslan: 725
*
Laurel: 530, 628, 633, 743, 812
*
Lavina: 636
*
Lewistown: 350, 366, 380, 535, 538, 707, 708, 968
*
Libby: 283, 291, 293, 334, 400
*
Lima
Lima ( ; ), founded in 1535 as the Ciudad de los Reyes (, Spanish for "City of Biblical Magi, Kings"), is the capital and largest city of Peru. It is located in the valleys of the Chillón River, Chillón, Rímac River, Rímac and Lurín Rive ...
: 276, 340
*
Lincoln: 362
*
Lindsay: 584
*
Livingston: 220, 222, 223, 224, 333, 823, 946
*
Lodge Grass: 639
*
Loma: 739
*
Malta
Malta, officially the Republic of Malta, is an island country in Southern Europe located in the Mediterranean Sea, between Sicily and North Africa. It consists of an archipelago south of Italy, east of Tunisia, and north of Libya. The two ...
: 301, 654, 680
*
Manhattan
Manhattan ( ) is the most densely populated and geographically smallest of the Boroughs of New York City, five boroughs of New York City. Coextensive with New York County, Manhattan is the County statistics of the United States#Smallest, larg ...
: 282, 284
*
Marion: 854, 991
*
Martinsdale: 572
*
Medicine Lake: 789
*
Melrose: 835
*
Melstone: 358
*
Melville: 537
*
Miles City: 232, 233, 234, 851, 852, 853, 874, 934, 944, 951
*
Missoula: 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: 669
*
Moore: 374
*
Musselshell: 947
*
Nashua: 746
*
Neihart: 236
*
North Broadus: 554
*
North Cut Bank: 336
*
North Frannie: 764
*
North Glasgow: 367
*
North Hinsdale: 648
*
North Nashua: 785
*
North Parkman: 643, 659
*
North Poplar: 448
*
North Havre: 394, 398
*
North Ryegate: 575
*
North Wolf Point: 392
*
Noxon: 847
*
Olney: 820, 881
*
Opheim: 762
*
Outlook: 895
*
Ovando: 793
*
Pablo: 275, 332, 675
*
Peerless: 893
*
Pendroy: 469
*
Philipsburg: 859
*
Plains: 826
*
Plentywood: 765
*
Plevna: 772, 971
*
Polson: 319, 872, 883, 884
*
Pompey's Pillar: 875
*
Poplar: 768
*
Potomac: 244
*
Power: 463
*
Rapelje: 663
*
Raynesford: 738
*
Red Lodge: 425, 426, 445, 446, 818
*
Reed Point: 326
*
Reserve: 286
*
Richey: 773, 979
*
Ridge: 767
*
Rock Springs: 354
*
Ronan: 528, 676, 833
*
Rosebud: 347
*
Roundup: 320, 323, 331, 913
*
Roy: 464, 954
*
Rudyard: 355
*
Ryegate: 568
*
Saco: 527
*
Saint Ignatius: 744, 745, 824
*
Saint Mary: 732
*
Savage: 776
*
Scobey: 487, 688
*
Scobey rural: 783
*
Seeley Lake: 210, 499, 677
*
Shelby: 424, 434, 450, 460, 470, 597, 966
*
Sheridan: 842
*
Sidney: 433, 478, 480, 482, 488, 489, 630, 943, 973
*
Silvertip: 574, 840
*
Somers: 393, 857
*
South Alberton: 864
*
South Broadus: 427
*
South Chester: 456
*
South Miles City: 421, 981
*
South Havre: 390, 395, 399
*
South Malta: 658
*
South Wolf Point: 525, 915
*
Stanford: 566
*
Stevensville: 625, 777
*
Stockett: 736
*
Saint Regis: 269, 280, 649
*
Sunburst: 561, 937
*
Superior: 382, 515, 822
*
Swan Lake: 612, 886
*
Sweetgrass: 335
*
Terry: 635, 637, 957
*
Thompson Falls: 242, 615, 827
*
Three Forks: 285, 616
*
Townsend: 266, 521, 949, 980
*
Troy: 295
*
Turner: 379
*
Twin Bridges: 684
*
Valier: 279
*
Victor: 642
*
Virginia City: 843
*
Valley Industrial Park: 524
*
Warm Springs: 693
*
West Beach: 877
*
Westby: 385
*
West Camp Crook: 972
*
West Glacier: 888
*
West Glendive: 687, 939, 941, 989
*
West Sidney: 798
*
West Squaw Gap: 569
[West Squaw Gap is served fro]
SQGPNDXARS5
Squaw Gap, ND
*
West Yellowstone: 640, 641, 646
*
Whitefish: 730, 862, 863
*
Whitehall: 287
*
Whitewater: 674
*
White Sulphur Springs: 305, 547
*
Wibaux: 795, 796
*
Wilsall: 578
*
Winifred: 462
*
Winnett: 429
*
Wisdom: 689
*
Wise River: 832
*
Wolf Creek: 235, 302
*
Wolf Point: 650, 653
*
Worden: 967
*
Wyola: 343
*
Yellow Bay: 692, 982
* Premium numbers: (1-406) 976
See also
*
List of North American Numbering Plan area code
References
External links
{{Area code list
406
406
Telecommunications-related introductions in 1947
1947 establishments in Montana