307 Area Code
Wyoming (statewide), Wyoming
Area code 307 is located in Wyoming (statewide), Wyoming. It covers Cheyenne, Casper, and surrounding areas in the Mountain time zone (UTC-7). Administered by NANPA.
Where is area code 307?
Area code 307 is located in Wyoming (statewide), Wyoming. It covers Cheyenne, Casper, and surrounding areas in the Mountain time zone (UTC-7).
Cities Covered by Area Code 307
Area code 307 primarily serves the Wyoming (statewide) area of Wyoming. The exact coverage includes Cheyenne, Casper, and Laramie, along with surrounding communities and suburbs.
Time Zone
Mountain Time — UTC-7
Area code 307 operates in the Mountain Time Zone. When calling 307 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 307
Area code 307 was introduced in 1947 as a geographic area code serving Wyoming (statewide), Wyoming. 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.