ZIP code · Sioux City · Iowa · United States
ZIP code 51104 — Sioux City
ZIP code 51104 serves Sioux City, Iowa.
- Postal code
- 51104Single source Value from one source, not cross-checked.
- City
- Sioux City
- County
- Woodbury
- State
- Iowa
- Country
- United States
- Coordinates
- 42.5254, -96.4005 — precision precise (locality)
View on OpenStreetMap - Population
- 22,792 (ZCTA, ACS 5-year)
- Median household income
- $74,984
- Median age
- 37
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 · census-acs5. Data generated on 2026-08-21. Methodology · Report an error on this page