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