Cerro Gordo County ZIP Codes

Cerro Gordo County is a county of Iowa.

ZIP codes: 11
Cities & towns: 10
Area codes: 1
Land area: 568 sq mi

Every ZIP code in Cerro Gordo County

504xx

The complete list of Cerro Gordo County, IA ZIP codes with the city each one delivers to.
ZIP code	City
50401	Mason City
50402	Mason City
50428	Clear Lake
50433	Dougherty
50457	Meservey
50464	Plymouth
50467	Rock Falls
50469	Rockwell
50477	Swaledale
50479	Thornton
50482	Ventura

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Cerro Gordo County

Area codes covering Cerro Gordo County

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

641 Area code 641

Where Cerro Gordo County's ZIP codes sit

Each point is the reference point of one Cerro Gordo 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 Cerro Gordo 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.