679 area code is an inactive telephone area code in the North American Numbering Plan (NANP) for Detroit in the state of Michigan, United States.
| Area Code | 679 |
|---|---|
| Major City | Detroit |
| Assigned | February 2000 |
| Cancelled | April 2000 |
| Service Date | 11/07/2025 |
| Time Zone | Eastern |
| Overlay Complex | 313/679 |
| Location | Michigan (MI) |
| Country | United States |
Area code 679 was established as the second area code to form the overlay plan with area code 313. However, the assistance schedule was canceled in April 2000, and until the overlay was discontinued.
Updated: Area code 679 is reactivated and will begin service on November 7, 2025.