| 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 |
|---|---|---|---|
| 231-487 | Emmet | Petoskey, MI | Ameritech Michigan |
| 231-488 | Manistee | Manistee, MI | Local Exchange Carriers Of Michigan |
| 231-492 | Grand Traverse | Traverse City, MI | Cellco Partnership DBA Verizon Wireless |
| 231-494 | Mecosta | Big Rapids, MI | American Messaging (am) |
| 231-497 | Charlevoix | Boyne City, MI | Sprint Spectrum L.p. |
| 231-498 | Antrim | Elk Rapids, MI | Level 3 Communications |
| 231-499 | Grand Traverse | Traverse City, MI | Cellco Partnership DBA Verizon Wireless |
| 231-508 | Manistee | Onekama, MI | Kaleva Telephone Company |
| 231-510 | Grand Traverse | Traverse City, MI | New Cingular Wireless PCS - IL |
| 231-512 | Grand Traverse | Traverse City, MI | American Messaging (am) |
| 231-514 | Wexford | Cadillac, MI | American Messaging (am) |
| 231-515 | Osceola | Evart, MI | Acd Telecom |
| 231-516 | Emmet | Petoskey, MI | American Messaging (am) |
| 231-518 | Kalkaska | Kalkaska, MI | Level 3 Communications |
| 231-519 | Newaygo | Newaygo, MI | Cellco Partnership DBA Verizon Wireless |
| 231-520 | Charlevoix | Charlevoix, MI | Local Exchange Carriers Of Michigan |
| 231-522 | Lake | Luther, MI | Lucre |
| 231-525 | Cheboygan | Wolverine, MI | Ameritech Michigan |
| 231-526 | Emmet | Harbor Springs, MI | Ameritech Michigan |
| 231-527 | Mecosta | Big Rapids, 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.