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Great Falls, MT is currently using only one area code which is area code 406. Area code 406 covers the entire state of
Montana, including Great Falls, and was put into service on January 1, 1947. In addition to Great Falls, MT area code 406 serves the larger communities of Billings, Bozeman, Butte, Helena, Kalispell and
Missoula. Great Falls, MT does not utilize any area code overlays. |
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