Affton, MO Demographics
Affton, MO is the 37th most populous of 1082 cities in Missouri, with 20,417 residents across 5 square miles. That is about 4,467 people per square mile.
At the 2020 census
| Population | 20,417 |
|---|---|
| Land area | 5 sq mi |
| Density | 4,467 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Affton, MO compares to the US
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About this page
City statistics cover the municipal boundary only, not the wider metro area.
Figures come from the 2020 census and the American Community Survey, compared against national averages.