Connecticut Area Codes

Area codes: 4
ZIP codes: 429
Cities & towns: 267
Planning regions: 9

Every area code in Connecticut

All Connecticut area codes, what each primarily serves, and which share ground with another.
Area code	Primarily serves	Shares ground with	In service
203	Bridgeport	475	1947
475	Bridgeport	203	2009
860	Hartford	959	1995
959	Hartford	860	2014

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

Which codes share the same ground

Connecticut 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.

203 475
860 959

Where Connecticut's communities sit

Each point is a Connecticut 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 Connecticut cities and their codes

largest 25

Scope every area code assigned to Connecticut. 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.