North American Numbers Source-cited · ownership disclosed
Area code
679
In service
United States · since 2025

Detroit (overlay)

All-services overlay of area code 313, covering the same Detroit / Wayne County territory; it added no new geography, only new number supply.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Detroit (overlay)
Type
geographic
Status
in service
In service since
2025
Projected exhaust
2091 Q2

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 679 is

Same as 313 — central and eastern Wayne County (Detroit and inner suburbs)..

Communities served wholly or partly by 679:

DetroitDearbornHamtramckHighland ParkGrosse PointeRedfordLincoln ParkTaylor

Shares 313's exact footprint; a 679 number is a Detroit-area number.

B · Relationships

How it relates to other codes

The codes 679 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2025 313 Detroit Overlays the identical 313 geography.
What's changing. Active overlay of 313 (in service Nov 7, 2025). Newest MI code — re-check NANPA for latest assignment details.
C · History

How 679 got here

2000-02
Originally reserved as a 313 overlay, then suspended April 2000.
Source: Wikipedia
2025-03-17
Overlay of 313 announced by Michigan authorities.
Source: Wikipedia
2025-11-07
Area code 679 went into service.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
14
Prefixes available
786

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 679 with another code →
Sources
Wikipedia ↗
Area codes 313 and 679
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.