Affton, Missouri Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Affton, Missouri is 20,035 as of the 2023 American Community Survey, making it the 39th-largest city in Missouri. The median household income is $77,337, the median home value is $200,300, and the median age is 41.7.
20,035
Population
4384
People / sq mi
$77,337
Median Income
$200,300
Median Home Value
Affton covers 4.6 sq mi of land at 4384 people per square mile.
About Affton, MO
Affton is a city in Missouri with a population of 20,035. It ranks #39 among cities in Missouri by population. The median age is 41.7, older than the national median. The population is 49.4% male and 50.6% female.
The median household income in Affton is $77,337, near the US median of $74,580. 3.3% of residents live below the federal poverty level. Home values sit at a median of $200,300, with monthly rent averaging $978. The homeownership rate of 80.5% is higher than the national rate of 64.8%.
Educational attainment in Affton reflects 35.0% of adults 25 and older holding a bachelor's degree or higher, near the national average of 34.3%. Roughly 9.4% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 23.0 minutes each way.
Race & Ethnicity
| White | 82.2% |
| Black or African American | 3.1% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.3% |
| Two or More Races | 0.0% |
Economy & Income
$77,337
Median Household Income
$43,832
Per Capita Income
3.3%
Poverty Rate
1.8%
Unemployment Rate
Housing
$200,300
Median Home Value
$978
Median Rent
80.5%
Owner-Occupied
Education
92.6%
High School+
35.0%
Bachelor's+
Commute
0.7%
Drive Alone
76.2%
Public Transit
9.4%
Work From Home
23.0 min
Avg Commute
Community Profile
15.6%
Foreign Born
83.1%
Non-English at Home
7.0%
Veterans
12.7%
With Disability
95.2%
Health Insurance
95.5%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 24.0% |
| Manufacturing | 11.3% |
| Finance, Insurance & Real Estate | 11.1% |
| Education, Health Care & Social Services | 9.1% |
| Retail Trade | 8.4% |
| Construction | 7.2% |
| Information | 7.1% |
| Arts, Entertainment & Food Services | 5.9% |
| Public Administration | 3.0% |
| Transportation & Warehousing | 2.3% |
| Agriculture & Mining | 0.2% |
Largest cities in Missouri
Largest counties in Missouri
Part of Missouri
Metro areas in Missouri
City rankings
Frequently Asked Questions
Affton, Missouri has a population of 20,035 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 39th-largest city in Missouri.
The median household income in Affton, Missouri is $77,337, with 3.3% of residents living below the federal poverty level.
The median home value in Affton, Missouri is $200,300, with median monthly rent at $978 and a homeownership rate of 80.5%.
The median age in Affton, Missouri is 41.7 years. The population is 49.4% male and 50.6% female.
More from Missouri
Population 508,233
Population 293,109
Population 169,432
Population 127,200
Population 121,944
Full rankings of Missouri cities by population
Statewide data for Missouri
Population, race, income, age, and trends across Missouri
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.