Michigan · Eastern Time
679 Area Code
Area code 679 is in Michigan, serving city of Detroit and nearby Wayne County communities. It is in the Eastern Time zone. It shares its territory with overlay code 313, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 679 area code?
679 is a Michigan area code covering city of Detroit and nearby Wayne County communities. In the wider directory it sits in the Midwest region.
Cities in the 679 area code
- Detroit
- Dearborn
- Dearborn Heights
- Hamtramck
- Highland Park
- Inkster
- Grosse Pointe
- Grosse Pointe Woods
- Grosse Pointe Park
- Harper Woods
Counties served by 679
Wayne County.
Time zone note: Eastern statewide except four Upper Peninsula counties near Wisconsin (Central).
679 overlay codes and dialing
The 679 territory is covered by an overlay of 2 area codes: 313, 679. All of them serve the same geographic area, and the original code is 313. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 679 area code
679 went into service on November 7, 2025 as an overlay of 313, relieving number exhaustion in the Detroit area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 679 a scam or spam risk?
679 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 679 number on your screen is no guarantee the caller is in Detroit, MI or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Michigan area codes
Explore more
See every code in Michigan, compare codes across the Midwest region, or view all Eastern Time codes. You can also browse the 6XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
679 area code FAQ
Where is the 679 area code?
The 679 area code is in Michigan, covering city of Detroit and nearby Wayne County communities, in the Midwest region.
What cities are in the 679 area code?
Cities in the 679 area code include Detroit, Dearborn, Dearborn Heights, Hamtramck, Highland Park, Inkster, Grosse Pointe, Grosse Pointe Woods, Grosse Pointe Park and Harper Woods.
What time zone is 679 in?
679 is in the Eastern Time zone. Eastern statewide except four Upper Peninsula counties near Wisconsin (Central).
What is the overlay for the 679 area code?
679 shares its territory with 313. Both codes (313, 679) serve the same area, so 10-digit dialing is required for every call.
When did the 679 area code start?
679 went into service on November 7, 2025 as an overlay of 313.
Do I have to dial 10 digits for 679?
Yes. Because 679 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 679 a toll-free or premium code?
No. 679 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.