District of Columbia Area Codes

Area codes: 2
ZIP codes: 277
Cities & towns: 3
Districts: 1

Every area code in District of Columbia

All District of Columbia area codes, what each primarily serves, and which share ground with another.
Area code	Primarily serves	Shares ground with	In service
202	Washington	771	1947
771	Washington	202	2021

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

Which codes share the same ground

District of Columbia has 1 group 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.

202 771

Where District of Columbia's communities sit

Each point is a District of Columbia 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 District of Columbia cities and their codes

largest 25

Scope every area code assigned to District of Columbia. 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.