231 Area Code
Northwestern Michigan, Michigan
Area code 231 is located in Northwestern Michigan, Michigan. It covers Traverse City, Muskegon, and surrounding areas in the Eastern time zone (UTC-5). Administered by NANPA.
Where is area code 231?
Area code 231 is located in Northwestern Michigan, Michigan. It covers Traverse City, Muskegon, and surrounding areas in the Eastern time zone (UTC-5).
Cities Covered by Area Code 231
Area code 231 primarily serves the Northwestern Michigan area of Michigan. The exact coverage includes Traverse City, Muskegon, and Holland (part), along with surrounding communities and suburbs.
Time Zone
Eastern Time — UTC-5
Area code 231 operates in the Eastern Time Zone. When calling 231 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 231
Area code 231 was introduced in 1999 as a geographic area code serving Northwestern Michigan, Michigan. 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.