City in St. Louis County, Missouri · 1.4 sq mi · 4,494 people per sq mi
6,399 people live in St. John. The typical household earns $53,755, and the median resident is 36 years old.
2026 projection
From 6,643 in 2020
Poverty rate 15.39%
Men 35.7 · Women 36.3
1880–2026
6,399
2026 projection
3.7% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1880–2026
6,399
2026 projection
3.7% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 6,399 | -42 | 0.65% |
|---|---|---|---|
| 2025 | 6,441 | -24 | 0.37% |
| 2024 | 6,465 | -12 | 0.19% |
| 2023 | 6,477 | -41 | 0.63% |
| 2022 | 6,518 | -67 | 1.02% |
| 2021 | 6,585 | -58 | 0.87% |
| 2020 | 6,643 | +1 | 0.02% |
| 2019 | 6,642 | +17 | 0.26% |
| 2018 | 6,625 | +11 | 0.17% |
| 2017 | 6,614 | -6 | 0.09% |
Showing 10 of 24 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
St. John has a population change lower than St. Louis County, Missouri, and the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 65 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 6 residents
40% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 40% | 44% | 36% |
| Never married | 33% | 33% | 33% |
| Divorced | 17% | 16% | 18% |
| Widowed | 5% | <1% | 9% |
| Separated | 5% | 7% | 4% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources