Tennessee Area Codes

Area codes: 8
ZIP codes: 785
Cities & towns: 548
Counties: 95

Every area code in Tennessee

All Tennessee area codes, what each primarily serves, and which share ground with another.
Area code	Primarily serves	Shares ground with	In service
423	Chattanooga	729	1995
615	Clarksville	629	1954
629	Clarksville	615	2015
729	Chattanooga	423	2025
731	Jackson	no overlay	2001
865	Knoxville	no overlay	1999
901	Memphis	no overlay	1947
931	Clarksville	no overlay	1997

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

Which codes share the same ground

Tennessee 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.

423 729
615 629

731, 865, 901 and 931 have no overlay: each is the only code serving its own territory.

Where Tennessee's communities sit

Each point is a Tennessee 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 Tennessee cities and their codes

largest 25

Scope every area code assigned to Tennessee. 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.