Sioux City city, Iowa
Official LSAD Designation: Sioux City city • Census GEOID: 1973335
• Plymouth County / Woodbury County
Demographics & Population Profile
Population and demographics for Sioux City city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 86,356 | — | 2025 | Census |
| Median Age | 34.9 yrs | ±0.6 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 32,926 | ±452 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).