406 Area Code

Primary cities: Billings, Missoula, Helena, Great Falls, Bozeman ... all cities

Cities: Absarokee, Alberton, Alta, Alzada, Anaconda, Arlee, Ashland, Augusta, Avon, Bainville, Baker, Belfry, Belgrade, Belt, Big Sandy, Big Sky, Big Timber, Bigfork, Billings, Birney, Bloomfield, Boulder, Box Elder, Bozeman, Brady, Bridger, Broadus, Broadview, Brockton, Browning, Busby, Butte, Canyon Creek, Carlyle, Carter, Cascade, Charlo, Chester, Chinook, Choteau, Circle, Clinton, Clyde Park, Colstrip, Columbia Falls, Columbus, Condon, Conrad, Cooke City, Crooked Creek, Culbertson, Custer, Cut Bank, Dagmar, Darby, Decker, Deer Lodge, Denton, Devon, Dillon, Divide, Dixon, Dodson, Drummond, Dupuyer, Dutton, East Conrad, East Glacier Park, Ekalaka, Elmo, Ennis, Ethridge, Eureka, Eureka Rural, Fairfield, Fairview, Fallon, Finley Point, Flaxville, Flaxville Rural, Forsyth, Fort Benton, Fort Peck, Fort Shaw, Fort Smith, Frazer, Frenchtown, Froid, Froid Rural, Fromberg, Gallatin Gateway, Gardiner, Geraldine, Geyser, Gildford, Glasgow, Glendive, Glentana, Grant, Grass Range, Great Falls, Hamilton, Hardin, Harlem, Harlowton, Harrison, Haugan, Havre, Hays, Helena, Highwood, Hingham, Hinsdale, Hobson, Hopp Illiad, Hot Springs, Hungry Horse, Huntley, Hysham, Jackson, Joliet, Joplin, Jordan, Judith Gap, Kalispell, Kevin Oilmont, Kremlin, Lakeside, Lambert, Lame Deer, Larslan, Laurel, Lavina, Lewistown, Libby, Lima, Lincoln, Lindsay, Livingston, Lodge Grass, Loma, Malta, Manhattan, Marion, Martinsdale, Medicine Lake, Melrose, Melstone, Melville, Miles City, Missoula, Molt, Moore, Musselshell, Nashua, Neihart, North Broadus, North Cut Bank, North Frannie, North Glasgow, North Havre, North Hinsdale, North Nashua, North Parkman, North Poplar, North Ryegate, North Wolf Point, Noxon, Olney, Opheim, Outlook, Ovando, Pablo, Peerless, Pendroy, Philipsburg, Plains, Plentywood, Plevna, Polson, Pompeys Pillar, Poplar, Potomac, Power, Rapelje, Raynesford, Red Lodge, Reedpoint, Reserve, Richey, Ridge, Rock Springs, Ronan, Rosebud, Roundup, Roy, Rudyard, Ryegate, Saco, Savage, Scobey, Scobey Rural, Seeley Lake, Shelby, Sheridan, Sidney, Silvertip, Somers, South Alberton, South Broadus, South Chester, South Havre, South Malta, South Miles City, South Wolf Point, St. Ignatius, St. Mary, St. Regis, Stanford, Stevensville, Stockett, Sunburst, Superior, Swan Lake, Sweetgrass, Terry, Thompson Falls, Three Forks, Townsend, Troy, Turner, Twin Bridges, Valier, Valley Industrial Park, Victor, Virginia City, Warm Springs, West Beach, West Camp Crook, West Glacier, West Glendive, West Sidney, West Squaw Gap, West Yellowstone, Westby, White Sulphur Springs, White Water, Whitefish, Whitehall, Wibaux, Wilsall, Winifred, Winnett, Wisdom, Wise River, Wolf Creek, Wolf Point, Worden, Wyola, Yellow Bay