Buchanan County ZIP Codes

Buchanan County is a county of Iowa.

ZIP codes: 11
Cities & towns: 11
Area codes: 2
Land area: 571 sq mi

Every ZIP code in Buchanan County

506xx–523xx

The complete list of Buchanan County, IA ZIP codes with the city each one delivers to.
ZIP code	City
50607	Aurora
50629	Fairbank
50641	Hazleton
50644	Independence
50648	Jesup
50650	Lamont
50671	Stanley
50682	Winthrop
52210	Brandon
52326	Quasqueton
52329	Rowley

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Buchanan County

Area codes covering Buchanan County

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

Where Buchanan County's ZIP codes sit

Each point is the reference point of one Buchanan 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 Buchanan 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.