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.

1 day ago · 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 …

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 …

Sep 16, 2025 · If you’ve seen a 231 number pop up on your phone, are planning a move, or want a local number for your business, this guide explains where the 231 area code is, which cities …

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

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

3 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 …

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 …

Where is Area Code 231? Area code (231) is in the state of MI. Below, are the major cities in the area code (231).

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 …