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
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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.
Affton Cdp, MO Climate
Affton Cdp, MO has an average annual temperature of 13.3°C (56°F) and receives about 982 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
13.3°C
Avg Temp
982
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -1° / 30° | 51 mm |
| February | 2° / 35° | 57 mm |
| March | 7° / 45° | 91 mm |
| April | 13° / 56° | 94 mm |
| May | 19° / 66° | 103 mm |
| June | 24° / 75° | 91 mm |
| July | 26° / 79° | 94 mm |
| August | 25° / 77° | 81 mm |
| September | 21° / 70° | 83 mm |
| October | 15° / 58° | 71 mm |
| November | 8° / 46° | 89 mm |
| December | 1° / 35° | 77 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Affton Cdp, MO
The most comfortable months to visit Affton Cdp, MO are typically September, May and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 32°C high). The coldest is January (near -6°C low). May is usually the wettest month.
Where to stay near 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.