| 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 |
|---|---|---|---|
| 231-568 | Grand Traverse | Traverse City, MI | Lucre |
| 231-569 | Emmet | Petoskey, MI | American Messaging (am) |
| 231-570 | Kalkaska | Fife Lake, MI | New Cingular Wireless PCS - IL |
| 231-571 | Muskegon | Muskegon, MI | Frontier North |
| 231-577 | Wexford | Cadillac, MI | Level 3 Communications |
| 231-578 | Muskegon | Muskegon, MI | Sprint Spectrum L.p. |
| 231-580 | Mecosta | Big Rapids, MI | Sprint Spectrum L.p. |
| 231-582 | Charlevoix | Boyne City, MI | Ameritech Michigan |
| 231-583 | Mason | Ludington, MI | Local Exchange Carriers Of Michigan |
| 231-584 | Antrim | Elmira, MI | Pigeon Telephone Co. |
| 231-585 | Antrim | Elmira, MI | Pigeon Telephone Co. |
| 231-587 | Antrim | Mancelona, MI | Ameritech Michigan |
| 231-588 | Antrim | Ellsworth, MI | Frontier North |
| 231-590 | Grand Traverse | Traverse City, MI | Cellco Partnership DBA Verizon Wireless |
| 231-591 | Mecosta | Big Rapids, MI | Ameritech Michigan |
| 231-592 | Mecosta | Big Rapids, MI | Ameritech Michigan |
| 231-593 | Wexford | Cadillac, MI | Usa Mobility Wireless |
| 231-594 | Oceana | Hart, MI | Lucre |
| 231-596 | Emmet | Harbor Springs, MI | Usa Mobility Wireless |
| 231-597 | Cheboygan | Cheboygan, MI | Ameritech Michigan |
There are 473 prefixes, In the code area, the major cities are Muskegon, MI;Norton Shores, MI;Shelby, MI. The major city is Muskegon.