Area code 406

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Map of Montana area code in blue (with border states and provinces)

Area code 406 is the telephone area code covering the entire state of Montana. It has been Montana's only area code since area codes were created in 1947.

As of 2013, there were 1.7 million lines served by 47 carriers; 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 2027; number pooling has been implemented in response to increased demand and inefficient use of 406 numbering resources.[1]

Area code 406 has telephone numbers assigned for the central office code 988. 988 has been designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which creates a conflict for exchanges that permit seven-digit dialing. This area code is therefore scheduled to transition to ten-digit dialing, mandatory after October 24, 2021.[2]

Exchanges in area code 406[]

  • 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: 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: 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: 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
  • : 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
  • : 432
  • Dillon: 596, 660, 683, 865, 925, 960, 988
  • Divide: 267, 553
  • Dixon: 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: 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
  • : 386
  • Hot Springs: 741
  • Hungry Horse: 387, 929
  • Huntley: 348
  • Hysham: 342
  • Jackson: 834
  • Joliet: 905, 962
  • Joplin: 292
  • Jordan: 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: 276, 340
  • Lincoln: 362
  • Lindsay: 584
  • Livingston: 220, 222, 223, 224, 333, 823, 946
  • Lodge Grass: 639
  • Loma: 739
  • Malta: 301, 654, 680
  • Manhattan: 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[3]
  • 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[4]
  • : 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[5]
  • 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[6]
  • Westby: 385
  • West Camp Crook: 972[7]
  • West Glacier: 888
  • West Glendive: 687, 939, 941, 989
  • West Sidney: 798
  • West Squaw Gap: 569[8]
  • 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
  • : 692, 982
  • Premium numbers: 976

Use by Google[]

On December 10, 2008, Google's Gmail Blog announced that SMS messages could be sent from inside Gmail. The messages are sent from numbers in the 406 area code. Each number is unique and can be bookmarked for replies or future use.[9]

Google also employs the use of area code 406 for the assignment of reply-to or callback numbers for Google Voice's customers' contacts.

References[]

  1. ^ "Montana PSC Granted Authority to Implement Mandatory Number Pooling". fcc.gov. 12 December 2015. Archived from the original on 10 December 2017. Retrieved 7 May 2018.
  2. ^ "Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline)" (PDF). North American Numbering Plan Administrator. January 8, 2021. Retrieved March 9, 2021.
  3. ^ North Parkman is served from wire centre DNRHWYMARS1 Archived 2014-10-19 at the Wayback Machine in Sheridan, WY
  4. ^ Ridge is served from HLTTWYXCRS1 Archived 2014-10-19 at the Wayback Machine Hulett, WY
  5. ^ Silvertip is served from POWLWYMARS1 Archived 2014-10-19 at the Wayback Machine Powell, WY
  6. ^ West Beach is served from BECHNDXADS1 Archived 2014-10-19 at the Wayback Machine in Beach, ND
  7. ^ West Camp Crook is served from CMCRSDXARL0 Archived 2014-10-19 at the Wayback Machine in Camp Crook, SD
  8. ^ West Squaw Gap is served from SQGPNDXARS5 Archived 2014-10-19 at the Wayback Machine Squaw Gap, ND
  9. ^ Official GMail Blog (10 December 2008). "Really new in Labs this time: SMS Text Messaging for chat". Archived from the original on 4 March 2011. Retrieved 5 March 2011.

See also[]

Montana area codes: 406
North: 236/672/778, 250, 306, 403, 587/825, 639
West: 208/986 area code 406 East: 605, 701
South: 307
Alberta area codes: 403, 587/825, 780
British Columbia area codes: 236/672/778, 250, 604
Saskatchewan area codes: 306, 639
Idaho area codes: 208/986
North Dakota area codes: 701
South Dakota area codes: 605
Wyoming area codes: 307
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