Onawa city, Iowa
Official LSAD Designation: Onawa city • Census GEOID: 1959115
• Monona County
Demographics & Population Profile
Population and demographics for Onawa city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 2,821 | — | 2025 | Census |
| Median Age | 35.5 yrs | ±3 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 1,256 | ±95 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).