ZIP code · Sioux City · Iowa · United States

ZIP code 51103 — Sioux City

Name: Sioux City (51103)
Address: Iowa, 51103, US

ZIP code 51103 serves Sioux City, Iowa.

Postal code: 51103
Single source Value from one source, not cross-checked.
City: Sioux City
County: Woodbury
State: Iowa
Country: United States
Coordinates: 42.5068, -96.4295 — precision precise (locality)
View on OpenStreetMap

Nearby localities

51101Sioux City
51102Sioux City
51104Sioux City
51105Sioux City
51106Sioux City
51108Sioux City
51109Sioux City
51111Sioux City

About this page

US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.

GeoNames. Data generated on 2026-08-21. Methodology · Report an error on this page