St. John city, Missouri
Official LSAD Designation: St. John city • Census GEOID: 2964478
• St. Louis County
Demographics & Population Profile
Population and demographics for St. John city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 6,441 | — | 2025 | Census |
| Median Age | 36 yrs | ±4.4 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 2,741 | ±262 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).