Area code 679 — Detroit and the Downriver communities
The first relief 313 has ever needed, and the newest code on this site. Detroit ran on a single area code from 1947 until November 2025 — seventy-eight years — and when the supply finally ran down, regulators added 679 across the same ground rather than dividing the city. Nobody in Detroit gave up 313.
New numbers available in 679Area code 679 covers Detroit and the Downriver communities: Dearborn, Highland Park, Hamtramck, Lincoln Park, Wyandotte, Allen Park and the Grosse Pointes.
It went into service on 7 November 2025 as an overlay on 313, which means it covers exactly the same territory and holds effectively all of the area’s free numbers.
Area code 679 at a glance
- State
- Michigan
- Region
- Detroit and the Downriver communities
- Time zone
- Eastern Time (ET)
- In service since
- November 7, 2025
- Type
- Overlay code
How a 679 number is built
Every North American number has four parts. Knowing where the seams fall answers most of what people ask about 679.
Cities and areas served by 679
- Detroit
- Dearborn
- Highland Park
- Hamtramck
- Lincoln Park
- Wyandotte
- Allen Park
- Grosse Pointe
Codes sharing the same area
One other code covers the same ground as 679.
Nearby area codes
Bordering Michigan and the surrounding region. A number in one of these is close to 679 but not in it.
How 679 came about
Seventy-eight years on one code, and then a second one laid over the top of it.
- 1947One of the original codesDetroit receives 313 in the first nationwide numbering plan. At the time it covers a very large share of south-eastern Michigan.
- 1993–2001The suburbs separateA run of splits removes the suburbs. 810 takes the north and east in 1993, then 734 and 248 take the west and north-west later in the decade. 313 is left with Detroit itself and the Downriver communities.
- 2023Exhaustion is forecast, and hearings are heldThe Michigan Public Service Commission takes public comment on relief for 313, which is projected to run out of unassigned numbers. An overlay is chosen: the alternative would mean part of Detroit changing its numbers.
- November 7, 2025679 goes into serviceNew numbers begin to be issued in the new code and ten-digit dialling becomes required for local calls. Every existing 313 line keeps its number.
Which code should you choose?
Two codes now cover Detroit, over exactly the same ground.
| Code | Since | How it reads |
|---|---|---|
| 679 | 2025 | Effectively all the free numbers in Detroit |
| 313 | 1947 | The city’s code for three generations; exhausted |
| 734 | 1996 | Ann Arbor and the western suburbs |
| 248 | 1997 | Oakland County, to the north |
313 carries more weight in Detroit than almost any code carries anywhere. 679 covers the same streets and is where the numbers actually are.
What people get wrong about 679
Is 679 used for spam calls?
679 is very new, and in the short term that cuts both ways. Few people recognise it yet, which makes it less useful to a caller trying to look familiar — but it also means a genuine 679 call may be treated as suspicious simply for being unrecognised. Neither reaction is evidence: caller ID is supplied by the originating system and any code can be displayed by anyone. Detroit sees the usual impersonation of utilities and city services. Since a 679 number has no track record to judge it by, the sensible habit is the same one that works for every code — end the call and ring the organisation on a number you looked up yourself.
Area code 679 FAQ
What area code is 679?
679 covers Detroit and the Downriver communities in Michigan, including Dearborn, Highland Park, Hamtramck, Lincoln Park, Wyandotte, Allen Park and the Grosse Pointes. It is an overlay on 313.
Is 679 a real area code?
Yes. It went into service on 7 November 2025 as the overlay for Detroit’s 313 and is where new Detroit numbers are now issued.
When did the 679 area code start?
7 November 2025. Providers began issuing 679 numbers on that date, and ten-digit dialling became required for local calls in the 313 area at the same time.
What is the difference between 679 and 313?
Nothing geographic — they cover identical territory. 313 has been Detroit’s code since 1947 and has run out of unassigned numbers; 679 was added to supply new ones.
Do I have to dial ten digits in Detroit now?
Yes. Once two codes share the same streets, seven digits no longer identify which one you mean. Ten-digit dialling became required when 679 entered service in November 2025.
Did anyone in Detroit have to change their phone number?
No. An overlay adds a code across the same territory rather than dividing it, so every existing 313 number stayed exactly as it was.
Is a 679 number less local than a 313?
Geographically they are identical. 313 carries far more recognition in Detroit, which is worth weighing if a customer seeing the number matters to you — but both reach the same city.
Can I still get a 313 number?
Only rarely. 313 was declared close to exhaustion, which is why 679 exists. If a specific number pattern matters, 679 is where the supply is.
What time zone is the 679 area code in?
Eastern — UTC−5 in winter and UTC−4 under daylight saving, the same as the rest of south-eastern Michigan.
How do I get a 679 business number?
Search 679 inventory, which holds effectively all the free numbers in Detroit, and set routing up before the number is printed on anything.
Getting a 679 business number
679 numbers are still being issued, so a business anywhere can hold one and route it to wherever its team actually works — you do not need an address in Michigan.
- STIR/SHAKENAttested, so calls are less likely to show as spam
- AI receptionistCover for the hours nobody is at a desk
- Free portingIf you already hold a 679 number
- Recording & SMSOn the same line, no add-on