If you have ever seen a phone number with the prefix 406, you are contacting the state of Montana, in the United States. The 406 area code is unique to Montana and has been so since the implementation of the North American Numbering Plan (NANP) in 1947. This makes it one of the original 86 area codes and one of the few that has never been divided or superimposed to meet growing demand.
Montana is a state with a relatively low population, which has allowed the 406 area code to serve the entire state. It covers japan phone number all 50 counties in Montana, including major cities such as Billings, Missoula, Great Falls, Bozeman and Butte-Silver Bow.
While demand for phone numbers has increased over time, 406 is expected to last until 2031 thanks to its exclusive use in Montana.
It is one of the original area codes implemented in 1947.
It is the only area code that serves the entire state of Montana.
It is one of the few area codes that has never been split or overlapped.
It covers all 50 counties and several major cities in Montana.
So the next time you see a phone number with the prefix 406, you'll know you're connecting to the beautiful state of Montana, known for its vast prairies, majestic mountains, and stunning national parks.