Johnston city, Iowa
Official LSAD Designation: Johnston city • Census GEOID: 1939765
• Polk County
Demographics & Population Profile
Population and demographics for Johnston city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 25,065 | — | 2025 | Census |
| Median Age | 37.4 yrs | ±2.1 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 9,259 | ±599 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).