Keokuk County ZIP Codes

Keokuk County is a county of Iowa.

ZIP codes: 15
Cities & towns: 15
Area codes: 2
Land area: 579 sq mi

Every ZIP code in Keokuk County

501xx–525xx

The complete list of Keokuk County, IA ZIP codes with the city each one delivers to.
ZIP code	City
50104	Gibson
50136	Keswick
50255	Thornburg
50268	What Cheer
52231	Harper
52248	Keota
52335	South English
52355	Webster
52550	Delta
52562	Hayesville
52563	Hedrick
52568	Martinsburg
52576	Ollie
52585	Richland
52591	Sigourney

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Keokuk County

Area codes covering Keokuk County

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

Where Keokuk County's ZIP codes sit

Each point is the reference point of one Keokuk 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 Keokuk 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.