Every ZIP code in Chickasaw County

506xx–521xx

The complete list of Chickasaw County, IA ZIP codes with the city each one delivers to.
ZIP code	City
50603	Alta Vista
50630	Fredericksburg
50645	Ionia
50658	Nashua
50659	New Hampton
50661	North Washington
52154	Lawler

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Chickasaw County

Area codes covering Chickasaw County

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

Where Chickasaw County's ZIP codes sit

Each point is the reference point of one Chickasaw 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 Chickasaw 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.