Sioux County ZIP Codes

Sioux County is a county of Iowa.

ZIP codes: 13
Cities & towns: 13
Area codes: 1
Land area: 768 sq mi

Every ZIP code in Sioux County

510xx–512xx

The complete list of Sioux County, IA ZIP codes with the city each one delivers to.
ZIP code	City
51003	Alton
51011	Chatsworth
51022	Granville
51023	Hawarden
51027	Ireton
51036	Maurice
51041	Orange City
51234	Boyden
51238	Hospers
51239	Hull
51244	Matlock
51247	Rock Valley
51250	Sioux Center

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Sioux County

Area codes covering Sioux County

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

712 Area code 712

Where Sioux County's ZIP codes sit

Each point is the reference point of one Sioux 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 Sioux 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.