Area code 406 is the telephone area code covering the entire state of Montana. It has been Montana's 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 2019; number pooling has been implemented in response to increased demand and inefficient use of 406 numbering resources.
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
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: 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
Hopp Illiad: 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
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 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: 976
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 in your phone for replies or future use.
Google also employs the use of area code 406 for the assignment of reply-to or callback numbers for Google Voice's customers' contacts.
