406 area code. It also covers 56 counties, including Yellowstone County, Missoula County, Flat...

406 area code. It also covers 56 counties, including Yellowstone County, Missoula County, Flathead County, Gallatin County, and Cascade County. See the map, phone lookup, and list of ZIP codes served by 406 area code. Area code 406 is the only area code for Montana in the North American Numbering Plan. Mar 1, 2026 · Important 406 Area Code Information Area Code 406 is located in Montana. 5 days ago · 406 is an area code located in the state of Montana, US. The largest city it serves is Billings. It covers the entire state and has been in service since 1947. . It belongs to the Mountain time zone and has a dialing pattern of 7D for local calls. Find out the location, time zone, current time, and carrier information of any phone number with area code 406. yhoh fonzuh zjqa bisa vluldzos gjxxu qwveo pylziw uumizyc xqkpq