Affton

County:: St. Louis County
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.

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, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Two or more races

Asian

Black or African American

Other race

Native American

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	16,460	82.16%
Two or more races	1,873	9.35%
Asian	871	4.35%
Black or African American	615	3.07%
Other race	216	1.08%
Native American	0	0%
Native Hawaiian or Pacific Islander	0	0%

Affton Marital Status

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