CDP in St. Louis County, Missouri · 4.6 sq mi · 4,370 people per sq mi
About 20,000 people live in Affton. The typical household earns $79,539, and the median resident is 42 years old.
2026 projection
From 19,580 in 2020
Poverty rate 6.65%
Men 40.3 · Women 43.4
2011–2026
19,972
2026 projection
2% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
2011–2026
19,972
2026 projection
2% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 19,972 | -21 | 0.11% |
|---|---|---|---|
| 2025 | 19,993 | -42 | 0.10% |
| 2023 | 20,035 | +113 | 0.57% |
| 2022 | 19,922 | +997 | 5.27% |
| 2021 | 18,925 | -655 | 3.35% |
| 2020 | 19,580 | -568 | 2.82% |
| 2019 | 20,148 | -39 | 0.19% |
| 2018 | 20,187 | -1,517 | 6.99% |
| 2017 | 21,704 | -356 | 1.61% |
| 2016 | 22,060 | +715 | 3.35% |
Showing 10 of 15 years.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 191 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 15 residents
48% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 48% | 51% | 45% |
| Never married | 31% | 31% | 30% |
| Divorced | 14% | 12% | 16% |
| Widowed | 7% | 5% | 8% |
| Separated | 1% | 1% | <1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
10 sources, all from the U.S. Census Bureau