Washington Area Codes

Area codes: 6
ZIP codes: 716
Cities & towns: 491
Counties: 39

Every area code in Washington

All Washington area codes, what each primarily serves, and which share ground with another.
Area code	Primarily serves	Shares ground with	In service
206	Seattle	360, 564	1947
253	Seattle	no overlay	1997
360	Seattle	206, 564	1995
425	Seattle	no overlay	1997
509	Spokane	no overlay	1956
564	Seattle	206, 360	2017

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

Which codes share the same ground

Washington 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.

206 360 564

253, 425 and 509 have no overlay: each is the only code serving its own territory.

Where Washington's communities sit

Each point is a Washington 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 Washington cities and their codes

largest 25

Scope every area code assigned to Washington. 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.