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