Area code 231 is a telephone area code in the North American Numbering Plan (NANP) for the northwestern portion of the Lower Peninsula in the U.S. state of Michigan.

Jan 1, 2026 · Area Code 231 is located in Michigan. It covers 105 cities, including Muskegon, Allendale, Traverse City, Cadillac, and Big Rapids. It also covers 22 counties, including Muskegon County, …

Area code 231 is located in Michigan. Get the area’s map, cities covered, current time, prefixes, and dialing instructions.

Browse area code 231 phone numbers, prefixes and exchanges. The 231 area code serves Grand Rapids, Traverse City, Muskegon, Mesick, Petoskey, covering 97 ZIP codes in 24 counties.

The 231 area code is serving the northwestern portion of the Lower Peninsula in the U.S. state of Michigan. To start a free reverse phone lookup, simply enter the full 10-digit number (including the …

Find 231 area code details including city, time zone, and map. Lookup area code 231 phone number, name, and location.

4 days ago · 231 is an area code located in the state of Michigan, US. The largest city it serves is Muskegon. Find out where 231 area code zone from, which states, counties and cities it covers. Get …

Dec 26, 2025 · Area code 231 is found in Michigan and serves the northwestern portion of Michigan’s Lower Peninsula. Area code 231 stretches all the way from Muskegon in the South to Petoskey in …

Fixed phone numbers in the United States, state Michigan (area code 231) are comprised of a single country code (+1), a 3 digit area code, a 3 digit local office code (or region code), and a 4 digit line …

List of ZIP Codes in Area Code 231 ... List of Counties in Area Code 231 ... List of Major Cities/Towns in Area Code 231 Muskegon