Humboldt County ZIP Codes

Humboldt County is a county of Iowa.

ZIP codes: 11
Cities & towns: 11
Area codes: 2
Land area: 434 sq mi

Every ZIP code in Humboldt County

505xx

The complete list of Humboldt County, IA ZIP codes with the city each one delivers to.
ZIP code	City
50519	Bode
50520	Bradgate
50529	Dakota City
50541	Gilmore City
50545	Hardy
50548	Humboldt
50558	Livermore
50570	Ottosen
50577	Renwick
50582	Rutland
50591	Thor

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Humboldt County

Area codes covering Humboldt County

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

Where Humboldt County's ZIP codes sit

Each point is the reference point of one Humboldt 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 Humboldt 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.