| 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 |
|---|---|---|---|
| 231-201 | Mecosta | Rodney, MI | New Cingular Wireless PCS - IL |
| 231-202 | Mecosta | Mecosta, MI | New Cingular Wireless PCS - IL |
| 231-203 | Emmet | Alanson, MI | New Cingular Wireless PCS - IL |
| 231-204 | Kalkaska | Fife Lake, MI | Usa Mobility Wireless |
| 231-205 | Emmet | Brutus, MI | Telnet Worldwide |
| 231-206 | Muskegon | Muskegon, MI | Sprint Spectrum L.p. |
| 231-207 | Benzie | Honor, MI | Telnet Worldwide |
| 231-208 | Charlevoix | Boyne Falls, MI | Telnet Worldwide |
| 231-209 | Leelanau | Suttons Bay, MI | Telnet Worldwide |
| 231-214 | Osceola | Leroy, MI | Usa Mobility Wireless |
| 231-215 | Muskegon | Muskegon, MI | Cellco Partnership DBA Verizon Wireless |
| 231-217 | Manistee | Bear Lake, MI | Telnet Worldwide |
| 231-218 | Grand Traverse | Traverse City, MI | Sprint Spectrum L.p. |
| 231-219 | Missaukee | Merritt, MI | Telnet Worldwide |
| 231-220 | Muskegon | Muskegon, MI | Local Exchange Carriers Of Michigan |
| 231-222 | Charlevoix | East Jordan, MI | Level 3 Communications |
| 231-223 | Antrim | Elk Rapids, MI | Peninsula Telephone Co. |
| 231-224 | Newaygo | Fremont, MI | Lucre |
| 231-225 | Newaygo | Fremont, MI | Level 3 Communications |
| 231-226 | Leelanau | Empire, MI | Telnet Worldwide |
There are 473 prefixes, In the code area, the major cities are Muskegon, MI;Norton Shores, MI;Shelby, MI. The major city is Muskegon.