Michigan Area Codes

Area codes: 13
ZIP codes: 1,159
Cities & towns: 881
Counties: 83

Every area code in Michigan

All Michigan area codes, what each primarily serves, and which share ground with another.
Area code	Primarily serves	Shares ground with	In service
231	Muskegon	no overlay	1999
248	Detroit	947	1997
269	Kalamazoo	no overlay	2002
313	Detroit	679	1947
517	Lansing	no overlay	1947
586	Detroit	no overlay	2001
616	Grand Rapids	no overlay	1947
679	Detroit	313	2025
734	Detroit	no overlay	1997
810	Flint	no overlay	1993
906	Garden	no overlay	1961
947	Detroit	248	2002
989	Saginaw	no overlay	2001

A code in the “shares ground” column is an overlay: it covers the same territory rather than a different part of Michigan, which is why local calls there are dialled as ten digits.

Which codes share the same ground

Michigan has 2 groups of codes that overlay one another: the codes inside a group cover the same territory rather than different parts of the state, so local calls there are dialled as ten digits.

248 947
313 679

231, 269, 517, 586, 616, 734, 810, 906 and 989 have no overlay: each is the only code serving its own territory.

Where Michigan's communities sit

Each point is a Michigan community, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Largest Michigan cities and their codes

largest 25

Scope every area code assigned to Michigan. Source LocalCallingGuide NPA list (2026-07 NPA list) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. Overlay relationships come from the numbering-plan authority; the city match is computed.