New Jersey Area Codes

Area codes: 10
ZIP codes: 723
Cities & towns: 582
Counties: 21

Every area code in New Jersey

All New Jersey area codes, what each primarily serves, and which share ground with another.
Area code	Primarily serves	Shares ground with	In service
201	Newark	551	1947
551	Newark	201	2001
609	Trenton	640	1956
640	Trenton	609	2018
732	Newark	848	1997
848	Newark	732	2001
856	Camden	no overlay	1999
862	Newark	973	2001
908	Newark	no overlay	1990
973	Newark	862	1997

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

Which codes share the same ground

New Jersey has 4 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.

856 and 908 have no overlay: each is the only code serving its own territory.

Where New Jersey's communities sit

Each point is a New Jersey 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 New Jersey cities and their codes

largest 25

Scope every area code assigned to New Jersey. 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.