| District of Michigan area codes: 313 | |
|---|---|
| Country | United States |
| State/Province | Michigan |
| Major City | Detroit |
| Time Zone | Eastern (UTC-05:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 313-242 | Wayne | Detroit, MI | Phone Michigan |
| 313-243 | Wayne | Detroit, MI | Phone Michigan |
| 313-244 | Oakland | Detroit, MI | New Cingular Wireless PCS - IL |
| 313-245 | Wayne | Detroit, MI | Ameritech Michigan |
| 313-246 | Wayne | Detroit, MI | Bandwidth.com Clec |
| 313-247 | Wayne | Melvindale, MI | Omnipoint Communications Midwest Operations LLC |
| 313-248 | Wayne | Dearborn, MI | Ameritech Michigan |
| 313-249 | Oakland | Southfield, MI | Ameritech Michigan |
| 313-250 | Wayne | Detroit, MI | Usa Mobility Wireless |
| 313-252 | Wayne | Highland Park, MI | Ameritech Michigan |
| 313-253 | Wayne | Dearborn, MI | Ameritech Michigan |
| 313-254 | Oakland | Southfield, MI | Level 3 Communications |
| 313-255 | Wayne | Detroit, MI | Ameritech Michigan |
| 313-256 | Wayne | Detroit, MI | Ameritech Michigan |
| 313-257 | Wayne | Detroit, MI | Usa Mobility Wireless |
| 313-258 | Oakland | Detroit, MI | Omnipoint Communications Midwest Operations LLC |
| 313-259 | Wayne | Detroit, MI | Ameritech Michigan |
| 313-260 | Wayne | Detroit, MI | American Messaging (am) |
| 313-261 | Wayne | Detroit, MI | American Messaging (am) |
| 313-262 | Wayne | Detroit, MI | Xo Communications Services |
There are 633 prefixes, In the code area, the major cities are Allen Park, MI;Dearborn, MI;Dearborn Heights, MI;D. The major city is Detroit.