| District of Michigan area codes: 231 | |
|---|---|
| Country | United States |
| State/Province | Michigan |
| Major City | Muskegon |
| Time Zone | Eastern (UTC-05:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 231-529 | Emmet | Brutus, MI | Centurytel Of Michigan Inc DBA Centurylink |
| 231-532 | Kalkaska | Kalkaska, MI | American Messaging (am) |
| 231-533 | Antrim | Bellaire, MI | Frontier North |
| 231-534 | Grand Traverse | Traverse City, MI | AT&T Local |
| 231-535 | Charlevoix | Boyne City, MI | Ameritech Michigan |
| 231-536 | Charlevoix | East Jordan, MI | Ameritech Michigan |
| 231-537 | Emmet | Levering, MI | Centurytel Of Michigan Inc DBA Centurylink |
| 231-538 | Newaygo | Fremont, MI | Local Exchange Carriers Of Michigan |
| 231-539 | Emmet | Pellston, MI | Ameritech Michigan |
| 231-543 | Osceola | Leroy, MI | Lucre |
| 231-544 | Antrim | Central Lake, MI | Frontier North |
| 231-546 | Antrim | Elmira, MI | Centurytel Of Michigan Inc DBA Centurylink |
| 231-547 | Charlevoix | Charlevoix, MI | Ameritech Michigan |
| 231-548 | Emmet | Alanson, MI | Centurytel Of Michigan Inc DBA Centurylink |
| 231-549 | Charlevoix | Boyne Falls, MI | Centurytel Of Michigan Inc DBA Centurylink |
| 231-556 | Charlevoix | Charlevoix, MI | Lucre |
| 231-557 | Muskegon | Muskegon, MI | Cellco Partnership DBA Verizon Wireless |
| 231-559 | Missaukee | Mc Bain, MI | Bandwidth.com Clec |
| 231-563 | Muskegon | Muskegon, MI | Lucre |
| 231-564 | Kalkaska | Kalkaska, MI | New Cingular Wireless PCS - IL |
There are 473 prefixes, In the code area, the major cities are Muskegon, MI;Norton Shores, MI;Shelby, MI. The major city is Muskegon.