St. Louis County Flag

St. Louis County

State:
Missouri
County Seat:
Clayton

St. Louis County's estimated 2025 population is 979,595 with a growth rate of -0.38% in the past year according to the most recent United States census data. St. Louis County is the 1st largest county in Missouri. The 2010 population was 998,846 and has seen a growth of -1.93% since that time.

979,595
Total Population
1,928
Population Density (mi²)
1
Population Rank (State)
-3.7K -0.38%
Annual Population Growth

St. Louis County Population

St. Louis County Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of St. Louis County includes 62.97% White, 24.15% Black or African American, 4.69% Asian, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Black or African American

Two or more races

Asian

Other race

Native American

Native Hawaiian or Pacific Islander

Race
Population
Percentage (of total)
White627,54262.97%
Black or African American240,68824.15%
Two or more races64,0636.43%
Asian46,7844.69%
Other race16,2641.63%
Native American1,0670.11%
Native Hawaiian or Pacific Islander2100.02%

St. Louis County Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

St. Louis County's average per capita income is $55,226. Household income levels show a median of $81,340. The poverty rate stands at 9.59%.

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$132,847$182,754
Families$108,392$152,088
Households$81,340$121,117
Non Families$47,961$67,005

$55,226

Average Income

$81,340

Median Household Income

9.59%

Poverty Rate