Area code 313: where it is and who calls from it
Area code 313 is in Michigan.
Michigan (Dearborn, the Grosse Pointes, Detroit, and the latter's enclaves of Hamtramck and Highland Park)
| Where | Michigan |
|---|---|
| Time zone | Eastern Time ยท local time |
| In service since | 1947 |
| Overlay | Yes, with 679 |
| Prefixes assigned | 769 of 792 possible (97%) |
Overlay: 313 covers the same area as 679. Overlay areas use 10-digit dialing, so a seven-digit number alone won't connect, and neighbors can have different area codes.
Where 313 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 313, with how many prefixes each has.
Who holds 313 numbers
- Mobile carrier 40%
- Local phone company 32%
- Internet / business phone carrier 22%
- Paging service 5%
- Phone company 2%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| AT&T (local phone) | Local phone company | 244 | 32% |
| T-Mobile (including Sprint) | Mobile carrier | 141 | 18% |
| AT&T Mobility | Mobile carrier | 95 | 12% |
| Verizon Wireless | Mobile carrier | 54 | 7% |
| Bandwidth | Internet / business phone carrier | 28 | 4% |
| Onvoy | Internet / business phone carrier | 28 | 4% |
| MCImetro (Verizon Business) | Internet / business phone carrier | 25 | 3% |
| American Messaging Services | Paging service | 24 | 3% |
| Level 3 (Lumen) | Internet / business phone carrier | 22 | 3% |
| Teleport Communications America | Internet / business phone carrier | 18 | 2% |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number.
States served: Michigan.
Other area codes in Michigan
231 248 269 517 586 616 679 734 810 906 947 989
Got a call from 313?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 313 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.