| 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 |
|---|---|---|---|
| 313-330 | Wayne | Detroit, MI | New Cingular Wireless PCS - IL |
| 313-331 | Wayne | Detroit, MI | Ameritech Michigan |
| 313-332 | Oakland | Southfield, MI | Level 3 Communications |
| 313-333 | Wayne | Detroit, MI | Sprint Spectrum L.p. |
| 313-334 | Oakland | Southfield, MI | Level 3 Communications |
| 313-335 | Wayne | Detroit, MI | Ameritech Michigan |
| 313-336 | Wayne | Dearborn, MI | Ameritech Michigan |
| 313-337 | Wayne | Dearborn, MI | Ameritech Michigan |
| 313-338 | Wayne | Detroit, MI | Ameritech Michigan |
| 313-339 | Wayne | Detroit, MI | American Messaging (am) |
| 313-340 | Wayne | Detroit, MI | Ameritech Michigan |
| 313-341 | Wayne | Detroit, MI | Ameritech Michigan |
| 313-342 | Wayne | Detroit, MI | Ameritech Michigan |
| 313-343 | Wayne | Detroit, MI | Ameritech Michigan |
| 313-344 | Wayne | Detroit, MI | Global Crossing Telemanagement-mi |
| 313-345 | Wayne | Detroit, MI | Ameritech Michigan |
| 313-346 | Oakland | Southfield, MI | Global Crossing Telemanagement-mi |
| 313-347 | Wayne | Detroit, MI | Allegiance Telecom Of Michigan |
| 313-348 | Wayne | Detroit, MI | Cellco Partnership DBA Verizon Wireless |
| 313-349 | Wayne | Hamtramck, MI | Omnipoint Communications Midwest Operations LLC |
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.