Area Code (406)

Absarokee, Alberton, Alta, Alzada, Amsterdam, Anaconda, Arlee, Ashland, Augusta, Avon, Bainville, Baker, Basin, Beach, 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, Camp Crook, Canyon Creek, Canyon Ferry, Carlyle, Carter, Cascade, Casper, Charlo, Chester, Chinook, Choteau, Circle, Clancy, Clinton, Clyde Park, Colstrip, Columbia Falls, Columbus, Condon, Conrad, Cooke City, Corvallis, Crow Agency, Culbertson, Custer, Cut Bank, Dagmar, Darby, Dayton Ranchester, Decker, Deer Lodge, Denton, Dillon, Divide, Dixon, Dodson, Drummond, Dupuyer, Dutton, East Conrad, East Glacier Park, East Helena, Ekalaka, Elmo, Ennis, Eureka, Eureka (Rural), Fairfield, Fairview, Fallon, Finley Point, Flathead Indian Reservation, Flaxville, Forsyth, Frazer, Frenchtown, Froid, Fromberg, Ft Benton, Ft Peck, Ft Shaw, Ft Smith, Gallatin Gateway, Gardiner, Geraldine, Geyser, Gildford, Glasgow, Glasgow Afb, Glendive, Glentana, Grass Range, Great Falls, Hamilton, Hardin, Harlem, Harlowton, Harrison, Haugan, Havre, Hays, Helena, Highwood, Hingham, Hinsdale, Hobson, Hopp Illiad, Hot Springs, Hulett, Hungry Horse, Huntley, Hysham, Jackson, Joliet, Joplin, Jordan, Judith Gap, Kalispell, Kremlin, Lakeside, Lambert, Lame Deer, Larslan, Laurel, Lavina, Lewistown, Libby, Lima, Lincoln, Lindsay, Livingston, Lodge Grass, Lolo, Loma, Malta, Manhattan, Marion, Martinsdale, Medicine Lake, Melrose, Melstone, Melville, Miles City, Milltown, Missoula, Molt, Moore, Musselshell, Nashua, Neihart, North Glasgow, North Havre, North Hinsdale, North Nashua, North Poplar, North Wolf Point, Noxon, Olney, Opheim, Opportunity, Outlook, Ovando, Pablo, Park City, Peerless, Pendroy, Philipsburg, Plains, Plentywood, Plevna, Polson, Poplar, Potomac, Powell, Power, Pray, Rapelje, Raynesford, Red Lodge, Reedpoint, Reserve, Richey, Roberts, Rock Springs, Ronan, Rosebud, Roundup, Roy, Rudyard, Ryegate, Saco, Savage, Scobey, Seeley Lake, Shelby, Shepherd, Sheridan, Sidney, Simpson Havre, Somers, South Chester, South Flaxville, South Havre, South Malta, South Wolf Point, Squaw Gap, St Ignatius, St Mary, St Regis, Stanford, Stevensville, Stockett (Sand Coulee), Sunburst, Superior, Swan Lake, Terry, Thompson Falls, Three Forks, Townsend, Troy, Turner, Twin Bridges, Ulm, Valier, Vaughn, Victor, Virginia City, Warm Springs, West Glacier, West Glendive, West Scobey, West Sidney, West Yellowstone, Westby, White Sulphur Springs, Whitefish, Whitehall, Whitewater, Wibaux, Wilsall, Winifred, Winnett, Wisdom, Wise River, Wolf Creek, Wolf Point, Worden, Wyola, Yellow Bay

Billings, Bozeman, Butte, Silver Bow, Great Falls, Havre, Helena, Kalispell, Missoula

Beaverhead, Big Horn, Blaine, Broadwater, Carbon, Carter, Cascade, Chouteau, Custer, Daniels, Dawson, Deer Lodge, Fallon, Fergus, Flathead, Gallatin, Garfield, Glacier, Golden Valley, Granite, Hill, Jefferson, Judith Basin, Lake, Lewis and Clark, Liberty, Lincoln, McCone, Madison, Meagher, Mineral, Missoula, Musselshell, Park, Petroleum, Phillips, Pondera, Powder River, Powell, Prairie, Ravalli, Richland, Roosevelt, Rosebud, Sanders, Sheridan, Silver Bow, Stillwater, Sweet Grass, Teton, Toole, Treasure, Valley, Wheatland, Wibaux, Yellowstone

Montana