1. World Map/
  2. North America/
  3. US/
  4. Area Codes/
  5. Area Code 231

Where Is Area Code 231?

Area code 231 is found in the US state of Michigan. Primarily servicing the city of Muskegon (population: 127212), area code 231 covers 21 counties of Michigan.

Located in the Eastern time zone, area code 231 is on the same time as New York, NY.

Area code 231 was brought into effect on June 5, 1999. 231 was split from the parent 616 area code.

Map of  with area code 231 highlighted

Counties in Area Code 231

  • Antrim,
  • Benzie,
  • Charlevoix,
  • Cheboygan,
  • Emmet,
  • Grand Traverse,
  • Kalkaska,
  • Kent,
  • Lake,
  • Leelanau,
  • Manistee,
  • Mason,
  • Mecosta,
  • Missaukee,
  • Montcalm,
  • Muskegon,
  • Newaygo,
  • Oceana,
  • Osceola,
  • Wexford.

Most Populous Cities in Area Code 231

City County City Population Time Zone
Muskegon Muskegon 127,212 EST
Traverse City Grand Traverse 71,553 EST
Cadillac Wexford 21,159 EST
Big Rapids Mecosta 20,342 EST
Greenville Montcalm 17,853 EST
Petoskey Emmet 16,974 EST
Ludington Mason 16,860 EST
Cheboygan Cheboygan 14,261 EST
Manistee Manistee 14,032 EST
Newaygo Newaygo 11,967 EST
Fremont Newaygo 10,950 EST
Twin Lake Muskegon 10,442 EST
Charlevoix Charlevoix 9,195 EST
Whitehall Muskegon 8,824 EST
Howard City Montcalm 8,599 EST
Grant Newaygo 8,320 EST
Kalkaska Kalkaska 8,203 EST
White Cloud Newaygo 8,003 EST
Kingsley Grand Traverse 7,974 EST
Boyne City Charlevoix 7,911 EST
Lake City Missaukee 7,758 EST
East Jordan Charlevoix 7,148 EST
Harbor Springs Emmet 7,089 EST
Montague Muskegon 6,823 EST
Mancelona Antrim 6,756 EST

Note: The above list is based off of the top 25 most populous cities in the area code as per 2012 United States Census Bureau estimates.

View all United States Area Codes.

Trending on WorldAtlas

This page was last modified on July 3, 2015.