Harrison County ZIP Codes

Harrison County is a county of Iowa.

ZIP codes: 10
Cities & towns: 10
Area codes: 1
Land area: 697 sq mi

Every ZIP code in Harrison County

515xx

The complete list of Harrison County, IA ZIP codes with the city each one delivers to.
ZIP code	City
51529	Dunlap
51545	Little Sioux
51546	Logan
51550	Magnolia
51555	Missouri Valley
51556	Modale
51557	Mondamin
51563	Persia
51564	Pisgah
51579	Woodbine

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Harrison County

Area codes covering Harrison County

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

712 Area code 712

Where Harrison County's ZIP codes sit

Each point is the reference point of one Harrison 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 Harrison 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.