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