Zip Code 51103 — Sioux City, IA
51103 is a ZIP Code associated with Sioux City, IA, located within Woodbury. The postal region supports an estimated population of 16,895 residents across Data Pending housing units, with a population density of 540.7 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (42.521730, -96.446420)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 51103 |
| Primary City | Sioux City |
| State / Province | IA |
| County | Woodbury |
| Total Population | 16,895 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 540.7 people/sq mi |
| Timezone | America/Chicago |
How 51103 Compares
| Metric | ZIP 51103 | Woodbury County | IA State Average |
|---|
| Population | 16,895 | 97,439 | 3,210,984 |
| Median Income | Data Pending | N/A | N/A |
| Population Density | 540.7 /sq mi | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →