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
Get Affton's next ACS population data
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Affton covers 4.6 sq mi of land at 4384 people per square mile.
About Affton, MO
Homeownership is the standout figure in Affton: 80.5% of homes are owner-occupied, higher than the national rate. Affton is a city in Missouri with a population of 20,035. It ranks #39 among cities in Missouri by population.
Median household income is $77,337, near the US median of $78,538. The poverty rate, 3.3%, is on the lower side for US cities and below the national 12.4%. Homes are comparatively cheap — a median value of $200,300, with typical rent around $978.
35.0% of adults 25 and older hold a bachelor’s degree, near the national average of 35.0%. Around 9.4% of workers work from home, below the national 14.0%, and the average commute runs about 23 minutes each way.
The ownership rate anchors the housing story in Affton, and tends to move with the age structure and home-value figures above.
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% |
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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.
Where to stay in Affton
Visiting or relocating to Affton, MO? Compare hotels and short-term rentals across the metro — live availability and prices.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.