Area codes in Detroit, Michigan
Detroit, Michigan uses 2 area codes — 313 and 679. The main Detroit area code is 313.
Area codes serving Detroit
Phone numbers in Detroit are written as ten digits — for example (313) 555-0190 — and fall in the Eastern Time zone.
How Detroit came to have 2 area codes
The original Detroit area code is 313, in service since 1947. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 679 (2025). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Detroit now uses all 2 codes and every local call is dialed with ten digits.
All Michigan area codes · Is a Detroit call a scam?
Nearby cities
- Windsor area codes
- Dearborn area codes
- Lincoln Park area codes
- Warren area codes
- Southfield area codes
- Troy area codes
- Livonia area codes
- Canton area codes
More cities in Michigan
- East Lansing area codes
- Wyoming area codes
- Grand Rapids area codes
- Ann Arbor area codes
- Holland area codes
- Flint area codes
- Lansing area codes
- Kalamazoo area codes
Frequently asked questions
What is the area code for Detroit?
The main area code for Detroit, Michigan is 313. Detroit is now served by 2 area codes in total: 313, 679.
How many area codes does Detroit have?
Detroit has 2 area codes: 313, 679.
Why does Detroit have more than one area code?
As Detroit used up the numbers available in its original area code (313, in service since 1947), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Detroit number?
Dial all 10 digits — the area code (313 or 679) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.