Affton Flag

Affton

County Seat:
No
Area (mi²):
4.57
State:
Missouri

Affton is a CDP located in St. Louis County, Missouri. Affton has a 2026 population of 19,972. Affton is currently declining at a rate of -0.11% annually and its population has decreased by 0% since the most recent census, which recorded a population of 0 in 2020.

The median household income in Affton is $79,539 with a poverty rate of 6.65%. The median age in Affton is 42 years: 40.3 years for males, and 43.4 years for females. For every 100 females there are 95.7 males.

20K
Total Population
4,370
Density (mi²)
-21 -0.11%
Growth

Affton Population

Affton Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202619,972-21-0.11%
202519,993-21-0.1%

Median Age

Overall: 42 years
Female: 43.4 years
Male: 40.3 years

Affton Adults

There are 15,718 adults, (3,716 of whom are seniors) in Affton.

Sex Ratio

Female: 9,735 (51.1%)
Male: 9,317 (48.9%)

Demographics

The racial composition of Affton includes 82.46% White, 3.2% Black or African American, and smaller percentages for Asian, other race, Native American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White15,71182.46%
Two or more races2,14311.25%
Black or African American6103.2%
Asian4042.12%
Other race1830.96%
Native American10.01%
Race
Population ↓
Percentage (of total)
Two or more races7183.77%
White2251.18%
Other race1510.79%
Black or African American370.19%
Race
Population ↓
Percentage (of total)
White15,48681.28%
Two or more races1,4257.48%
Black or African American5733.01%
Asian4042.12%
Other race320.17%
Native American10.01%

Affton Marital Status

Economics and Income Statistics

Affton 's average per capita income is $54,024. Household income levels show a median of $79,539. The poverty rate stands at 6.65%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median ↓
Mean
Married Families$114,489-
Families$102,045$112,761
Households$79,539$101,652
Non Families$58,293$83,328

$54,024

Average Income

$79,539

Median Household Income

6.65%

Poverty Rate

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)