Area code 406 is a standard telephone area code in the U.S. state of Montana. It served the whole state of Montana.
Montana Counties within Area Code 406:
Yellowstone, Missoula, Flathead, Gallatin, Cascade, Lewis and Clark, Ravalli, Silver Bow, Lake, Lincoln, Hill, Park, Glacier, Big Horn, Custer, Fergus, Sanders, Jefferson, Roosevelt, Carbon, Richland, Deer Lodge, Beaverhead, Rosebud, Stillwater, Dawson, Madison, Valley, Powell, Blaine, Pondera, Teton, Chouteau, Broadwater, Toole, Musselshell, Philips, Mineral, Sweet Grass, Sheridan, Granite, Fallon, Liberty, Wheatland, Judith Basin, Meager, Daniels, Powder River, McCone, Garfield.
Montana Major Cities within Area Code 406:
Billings, Missoula, Great Falls, Bozeman, Butte-Silver Bow, Helena, Kalispell, Havre, Anaconda-Deer Lodge County, Miles City, Helena Valley Southeast, Helena Valley West Central, Evergreen, Belgrade, Livingston, Lockwood, Laurel, Whitefish, Lewiston, Orchard Homes, Sidney, Glendive, Columbia Falls, Polson, Hamilton, Bigfork, Dillon, Lolo, Hardin, Helena Valley Northwest, Malmstrom AFB, Shelby, Glasgow, Four Corners, Deer Lodge, Helena Valley Northeast, Cut Bank, Montana, Lakeside, Libby, Wolf Point, Conrad, North Browning, Big Sky, Pablo, Colstrip, East Missoula, Red Lodge, Lame Deer, Malta.
Area Code 406 Time Zone?
Mountain Time UTC -7:00 / -6:00
Go here to see the complete list of United States Area Codes.