The 679 area code is Detroit's newest telephone code — an overlay launched on November 7, 2025 across the same Wayne County footprint already served by 313. It doesn't replace 313 or move any existing numbers; it simply gives Detroit and its closest suburbs a second pool of numbers to draw from, now that ten-digit dialing is required on every local call. Metro Detroit sits in the Eastern Time Zone.
This guide covers exactly where 679 reaches, why Michigan chose an overlay instead of another split, the region's numbering history back to 1947, and what's driving demand for new Detroit numbers today.
Where the 679 area code reaches
The 679 area code location matches 313 exactly — Detroit and most of its closest suburbs within Wayne County, Michigan.
679 / 313 coverage by zone:
| Zone | Communities |
|---|---|
| Core city | Detroit |
| Enclave cities | Hamtramck, Highland Park |
| Inner suburbs | Dearborn, Dearborn Heights, Harper Woods, the Grosse Pointe communities |
| Outer suburbs | Allen Park, Ecorse, Inkster, Lincoln Park, Melvindale, Redford, River Rouge |
What 679 does NOT cover:
- Ann Arbor & western Wayne County → 734
- Oakland County (Southfield, Troy) → 248
- Macomb County (Warren, Sterling Heights) → 586
- Flint & the Thumb → 810
Why 679 overlays 313 instead of splitting it
By the early 2020s, Wayne County's supply of unused 313 prefixes was projected to run out. Rather than redraw the map and force half of Detroit onto a new code — the way earlier Michigan splits did — the Michigan Public Service Commission approved an all-services overlay: 679 was assigned to the identical territory as 313, and new lines began drawing from it once the pool opened.
What the overlay means for callers:
A Dearborn business on 313-XXX-XXXX and a new office two blocks away on 679-XXX-XXXX sit on the exact same streets — same rates, same local calling area. Mandatory ten-digit dialing (area code plus seven digits) took effect on October 7, 2025, a month ahead of 679 going live, because the two codes can no longer be told apart from the seven-digit number alone.
Detroit & Wayne County area code history
1947 — Area code 313 was assigned as one of the original 86 North American area codes, covering all of southeastern Michigan, including Detroit, Flint, and the Thumb.
December 1, 1993 — As Detroit's northern suburbs and Flint grew, area code 810 split off to serve them, shrinking 313's territory to closer-in Wayne County and points south.
December 13, 1997 — A second split created 734 for Ann Arbor, Monroe County, and western Wayne County, narrowing 313 further to Detroit and its nearest suburbs.
March 17, 2025 – November 7, 2025 — With 313's remaining supply running low, Michigan regulators announced the 679 overlay in March and brought it into service that November, without redrawing the map again.
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Is 679 the same as Fiji's +679?
It's a natural mix-up: +679 is also the international dialing code for Fiji. The two have nothing to do with each other — Fiji's +679 is a country code used when dialing into Fiji from abroad, while Detroit's 679 is a domestic area code used only within the North American Numbering Plan.
A call to a 679 Detroit number is dialed as 1-679-XXX-XXXX from anywhere in the US; a call to Fiji is dialed with a completely different international prefix. If a "679" number looks unfamiliar, check whether it's formatted as a 10-digit US number or an international one before assuming either.
What's driving demand for Detroit numbers
Detroit's economy has diversified well beyond its automotive roots, and that growth is a big part of why 313 needed a second code:
Mobility and auto tech Ford, General Motors, and a growing cluster of mobility startups anchor the region, with Ford's Michigan Central redevelopment in Corktown drawing new tech tenants and new phone lines into the city.
Healthcare systems Henry Ford Health, headquartered in Detroit, is one of the region's largest employers, with a hospital and clinic network spanning the 313/679 footprint.
Small business recovery Downtown Detroit and Dearborn have both seen steady small-business growth over the past decade, each new storefront and office typically adding at least one new local line.
Many of these growing Detroit businesses are moving phone systems onto UCaaS (Unified Communications as a Service) — one cloud platform for calling, video, and messaging that scales as a company adds locations, much like the numbering growth that pushed 269 and other Michigan codes to expand over the years. Contact us to set up a 679 or 313 number for your Detroit-area business.
Time zone & how to dial a 679 number
Metro Detroit runs on Eastern Time (ET) — EST (UTC −5) in winter, EDT (UTC −4) during Daylight Saving Time. Local calls within the 313/679 overlay require all ten digits: dial 1, then the area code, then the seven-digit number, even when calling a neighbor across the street.
Is 679 a scam number?
Because 679 is a brand-new code, scammers frequently spoof it to look like a fresh, unfamiliar local number and catch Detroit residents off guard. Watch for vehicle warranty pitches, fake toll-payment texts, and utility-shutoff threats. The FCC's STIR/SHAKEN call authentication framework requires carriers to verify caller ID before a call connects, but no system catches everything — treat unexpected 679 calls asking for payment or personal details as suspicious.
Key takeaways
- 679 overlays 313 across Detroit and Wayne County, Michigan, in service since November 7, 2025.
- No geographic split — 679 and 313 share identical territory; ten-digit dialing has been mandatory since October 7, 2025.
- Don't confuse it with +679, Fiji's international country code — 679 is strictly a US domestic area code.
- Time zone: Eastern (ET) throughout.
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Frequently asked questions
What is the 679 area code?
Area code 679 is a new overlay covering Detroit and its closest Wayne County suburbs. It shares its exact territory with the existing 313 area code.
Where is the 679 area code located?
Area code 679 covers Detroit, Dearborn, Hamtramck, Highland Park, Harper Woods, the Grosse Pointe communities, and other nearby Wayne County suburbs in Michigan.
Is 679 the same as Fiji's +679?
No. Fiji's +679 is an international country code; Detroit's 679 is a US domestic area code. They're unrelated and dialed completely differently.
Is 679 a spam number?
Not inherently — 679 is a legitimate Detroit-area code. Because it's new, scammers do spoof it to seem unfamiliar and local, so treat unexpected calls with caution.
What time zone is the 679 area code?
Area code 679 is in the Eastern Time Zone (ET) — EST (UTC −5) in winter and EDT (UTC −4) during Daylight Saving Time.
When did the 679 area code start?
The Michigan Public Service Commission announced the 679 overlay on March 17, 2025, and it went into service on November 7, 2025.
How do I get a 679 area code number?
Sign up with a VoIP provider such as My Country Mobile, search for available 679 numbers, choose a Detroit-area prefix, select a plan, and activate.
Do I need to dial 313 and 679 differently?
No — both require the same ten-digit format (area code plus seven digits) for every local call, since the two codes share one calling area.
