Affton, Missouri Demographics & Population 2026
During the 2020–2024 ACS period, Affton, Missouri had a total population of 19,052, the 41st largest community in Missouri, with a median household income of $79,539, which is 12% higher than the state average. The poverty rate is 6.7%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Near full employment with an unemployment rate of just 1.5%.
Affton Quick Facts
How Affton Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 20,035 | 19,052 | -4.9% |
| Median household income | $77,337 | $79,539 | +2.8% |
| Median home value | $200,300 | $212,400 | +6.0% |
How Affton Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 40 | National average: 61
Education
Educational Attainment (Adults 25+)
Affton Rankings in Missouri
Explore Missouri Rankings
Other Cities in St. Louis County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Florissant | 51,773 | $65,318 | 10.1% | $148,800 |
| Chesterfield | 49,574 | $133,037 | 3.9% | $472,500 |
| Oakville | 35,333 | $106,362 | 6.4% | $318,600 |
| Wildwood | 35,133 | $161,060 | 2.2% | $495,800 |
| University City | 34,685 | $80,694 | 14.5% | $306,700 |
| Ballwin | 31,279 | $124,626 | 4.8% | $377,100 |
| Mehlville | 29,805 | $67,071 | 7.8% | $218,400 |
| Kirkwood | 29,363 | $121,270 | 5.3% | $451,400 |
| Maryland Heights | 27,880 | $86,436 | 4.7% | $227,000 |
| Hazelwood | 25,114 | $55,908 | 15.9% | $167,400 |
Cities Similar to Affton
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Concord | 18,368 | $89,038 | $303,600 | 42.0% | 3.9% |
| Arnold | 20,956 | $78,370 | $220,000 | 25.4% | 8.2% |
| Republic | 19,829 | $65,729 | $211,500 | 26.3% | 17.7% |
| Manchester | 18,160 | $97,801 | $323,100 | 62.4% | 6.4% |
| Old Jamestown | 20,651 | $99,521 | $236,100 | 39.6% | 7.4% |
Population Overview
Affton is a small city located in Missouri, within St. Louis County. The total population is 19,052. It ranks as the 41st most populous out of 1,062 Census-designated places in Missouri.
Age Demographics
The median age in Affton is 42.0 years. This is 8% higher than the state median of 39.0 years.
Economy, Income & Housing
The median household income in Affton is $79,539. This is 12% higher than the state median of $70,702. It is also 1% lower than the national median of $80,734. The poverty rate stands at 6.7%. This is 47% lower than the state poverty rate of 12.6%. The unemployment rate is 1.5%. This is 64% lower than the state rate of 4.0%. The median home value is $212,400. Housing costs are 8% lower than the state median of $230,300. With a home-value-to-income ratio of just 2.7x, Affton is one of the most affordable housing markets in the area. 80.8% of occupied housing units are owner-occupied. This homeownership rate is 19% higher than the state average of 68.1%.
Race & Ethnicity
The largest racial or ethnic group in Affton is White (non-Hispanic), making up 81.3% of the population. Hispanic or Latino residents account for 5.9%. The Black or African American population (3.0%) is well below the state average of 10.9%.
Education
36.6% of residents aged 25 and older hold a bachelor's degree or higher. This is 13% higher than the state rate of 32.4%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 91.9%. Notably, 15.4% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All demographic data for Affton, Missouri is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Missouri state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,062 Census-designated places in Missouri. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
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Frequently Asked Questions
What is the population of Affton, Missouri?
Affton, Missouri has a population of 19,052 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Affton, MO?
The median household income in Affton is $79,539, which is 1% lower than the national median of $80,734.
What is the poverty rate in Affton, MO?
The poverty rate in Affton is 6.7%. This means approximately 1,266 residents live below the federal poverty line.
What is the racial makeup of Affton, Missouri?
Affton's population is 81.3% White, 3.0% Black, 5.9% Hispanic/Latino, and 2.1% Asian.
What is the median home value in Affton, MO?
The median home value in Affton is $212,400. The home-value-to-income ratio is 2.7x.
How educated is Affton, Missouri?
36.6% of adults (25+) in Affton hold a bachelor's degree or higher, and 15.4% hold a graduate or professional degree.