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 2025 population of 19,826. Affton is currently declining at a rate of -0.16% annually but its population has increased by 1.26% since the most recent census, which recorded a population of 19,580 in 2020.

The average household income in Affton is $98,097 with a poverty rate of 5.56%.The median age in Affton is 41.7 years: 40.4 years for males, and 43 years for females.

19.8K
Total Population
4,338
Density (mi²)
-32 -0.16%
Growth

Affton Population

Affton Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Affton includes 82.16% White, 4.35% Asian, 3.07% Black or African American, and smaller percentages for other race and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White16,46082.16%
Two or more races1,8739.35%
Asian8714.35%
Black or African American6153.07%
Other race2161.08%

Affton Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Affton's average per capita income is $52,923. Household income levels show a median of $77,337. The poverty rate stands at 5.56%.

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$110,427-
Families$99,483$108,426
Households$77,337$98,097
Non Families$55,417$80,209

$52,923

Average Income

$77,337

Median Household Income

5.56%

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)