Every ZIP code in Monona County

510xx–515xx

The complete list of Monona County, IA ZIP codes with the city each one delivers to.
ZIP code	City
51010	Castana
51034	Mapleton
51040	Onawa
51051	Rodney
51060	Ute
51063	Whiting
51523	Blencoe
51558	Moorhead
51572	Soldier

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Monona County

Area codes covering Monona County

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

Where Monona County's ZIP codes sit

Each point is the reference point of one Monona 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 Monona 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.