Cowlitz County ZIP Codes

Cowlitz County is a county of Washington.

ZIP codes: 11
Cities & towns: 11
Area codes: 3
Land area: 1,141 sq mi

Every ZIP code in Cowlitz County

985xx–986xx

The complete list of Cowlitz County, WA ZIP codes with the city each one delivers to.
ZIP code	City
98581	Ryderwood
98603	Ariel
98609	Carrolls
98611	Castle Rock
98616	Cougar
98625	Kalama
98626	Kelso
98632	Longview
98645	Silverlake
98649	Toutle
98674	Woodland

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Cowlitz County codes above are listed without a column we would have to invent.

Cities and towns in Cowlitz County

A further 6 places in Cowlitz County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.

Area codes covering Cowlitz County

Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.

Where Cowlitz County's ZIP codes sit

Each point is the reference point of one Cowlitz County ZIP code, 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

Scope every ZIP code recorded in Cowlitz County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.