Richland County ZIP Codes

Richland County is a county of Wisconsin.

ZIP codes: 5
Cities & towns: 5
Area codes: 2
Land area: 586 sq mi

Every ZIP code in Richland County

535xx–539xx

The complete list of Richland County, WI ZIP codes with the city each one delivers to.
ZIP code	City
53540	Gotham
53556	Lone Rock
53581	Richland Center
53584	Sextonville
53924	Cazenovia

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Richland County

A further 2 places in Richland 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 Richland County

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

Where Richland County's ZIP codes sit

Each point is the reference point of one Richland 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 Richland 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.