406 Area Code
Montana (statewide), Montana
Area code 406 is located in Montana (statewide), Montana. It covers Billings, Missoula, and surrounding areas in the Mountain time zone (UTC-7). Administered by NANPA.
Where is area code 406?
Area code 406 is located in Montana (statewide), Montana. It covers Billings, Missoula, and surrounding areas in the Mountain time zone (UTC-7).
Cities Covered by Area Code 406
Area code 406 primarily serves the Montana (statewide) area of Montana. The exact coverage includes Billings, Missoula, and Great Falls, along with surrounding communities and suburbs.
Time Zone
Mountain Time — UTC-7
Area code 406 operates in the Mountain Time Zone. When calling 406 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 406
Area code 406 was introduced in 1947 as a geographic area code serving Montana (statewide), Montana. It remains the primary area code for this region. Area codes are administered by NANPA (North American Numbering Plan Administration), the organization responsible for managing phone number resources in the US and Canada.