Affton, MO
Population 20,035 · Missouri
About Affton, MO
Affton is a mid-sized city in Missouri with a population of 20,035 residents. The median household income is $77,337 per year, which is above the national average. The median age in Affton is 41.7 years.
Housing in Affton has a median home value of $200,300 and median monthly rent of $978. Of the 9,278 total housing units, the majority are owner-occupied, with 7,138 owner-occupied and 1,724 renter-occupied units.
The unemployment rate in Affton is 2.5% and the poverty rate is 5.6%. 35.0% of residents hold a bachelor's degree or higher. The average commute time is 23 minutes.
How Affton Ranks in Missouri
Cost of Living in Affton, MO
Compared to national averages, Affton has a median household income of $77,337 (3% above the national median of $75,149). Home values average $200,300, which is 18% below the national median. Monthly rent at $978 is 16% below the US average of $1,163. Within Missouri, Affton's income is 27% above the state average of $61,047, and home values are 33% above the state median of $150,786.
Why Live in Affton, MO?
Affton offers a strong local economy with a median household income of $77,337, well above the national average, and affordable housing with a median home value of $200,300, below the US average of $244,900, and rent that’s lower than the national average at $978/month. Additionally, the city features a strong job market with an unemployment rate of just 2.5%, and a well-educated community where 35.0% of residents hold a bachelor’s degree or higher, and a low poverty rate of 5.6%, better than the national average, and short commute times averaging just 23 minutes.
Affton has a population of 20,035 with a median age of 41.7 years. Compare Affton with other cities to see how it stacks up, or explore all cities in Missouri.
Similar Cities Near Affton
Cities in Missouri with a similar population size.
| City | Population | Median Income | Home Value | |
|---|---|---|---|---|
| Rolla | 20,144 | $42,518 | $177,400 | Compare |
| Warrensburg | 19,437 | $57,232 | $216,900 | Compare |
| Republic | 19,233 | $64,364 | $190,300 | Compare |
| Arnold | 20,884 | $75,194 | $209,700 | Compare |
| Old Jamestown | 21,121 | $107,250 | $230,100 | Compare |
| Creve Coeur | 18,643 | $119,454 | $566,100 | Compare |
| Ferguson | 18,350 | $46,106 | $99,300 | Compare |
| Sedalia | 21,869 | $50,668 | $136,500 | Compare |
Demographics
Racial & Ethnic Composition
Economy & Education
Housing
Other Cities in Missouri
Data source: US Census Bureau ACS 5-Year Estimates. Last updated: 2026-04-05.
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Frequently Asked Questions about Affton
What is the population of Affton, MO?
The population of Affton, MO is 20,035 according to the latest Census data.
What is the median household income in Affton?
The median household income in Affton, MO is $77,337 per year.
What is the median home value in Affton?
The median home value in Affton, MO is $200,300.
What is the average rent in Affton?
The median monthly rent in Affton, MO is $978.
What is the unemployment rate in Affton?
The unemployment rate in Affton, MO is 2.5%.