Every ZIP code in Winnebago County

504xx

The complete list of Winnebago County, IA ZIP codes with the city each one delivers to.
ZIP code	City
50424	Buffalo Center
50436	Forest City
50450	Lake Mills
50453	Leland
50465	Rake
50473	Scarville
50478	Thompson

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Winnebago County

Area codes covering Winnebago County

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

Where Winnebago County's ZIP codes sit

Each point is the reference point of one Winnebago 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 Winnebago 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.