Every ZIP code in Colusa County

959xx

The complete list of Colusa County, CA ZIP codes with the city each one delivers to.
ZIP code	City
95912	Arbuckle
95932	Colusa
95950	Grimes
95955	Maxwell
95970	Princeton
95979	Stonyford
95987	Williams

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Colusa County codes above are listed without a column we would have to invent.

Cities and towns in Colusa County

A further 5 places in Colusa 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 Colusa County

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

Where Colusa County's ZIP codes sit

Each point is the reference point of one Colusa 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 Colusa 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.