Poweshiek County ZIP Codes

Poweshiek County is a county of Iowa.

ZIP codes: 8
Cities & towns: 8
Area codes: 2
Land area: 585 sq mi

Every ZIP code in Poweshiek County

501xx–522xx

The complete list of Poweshiek County, IA ZIP codes with the city each one delivers to.
ZIP code	City
50112	Grinnell
50157	Malcom
50171	Montezuma
50242	Searsboro
52211	Brooklyn
52221	Guernsey
52222	Deep River
52232	Hartwick

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Poweshiek County

Area codes covering Poweshiek County

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

Where Poweshiek County's ZIP codes sit

Each point is the reference point of one Poweshiek 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 Poweshiek 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.