St. Louis County, Missouri
Located in Missouri, St. Louis County has a population of 995,569 residents and a median age of 40.3 years, making it the #50 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 9.8%. The median home value is $276,800, and the median household income is $82,936, which is 10% above the national median.
Demographics
St. Louis County has a population of 995,569, making it the #50 most populous county in the US. The median age is 40.3 years, which is 3.6% above the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in St. Louis County is $82,936, ranking #487 out of 3,222 counties — 10.4% above the national median. The poverty rate is 9.8% and unemployment stands at 4.3%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in St. Louis County is $276,800 (-1.8% vs national). Renters pay a median of $1,209/mo and the homeownership rate is 69.2%.
Median Home Value Trend
Rankings →Household Type
Education
In St. Louis County, 47.4% of adults age 25+ hold a bachelor's degree or higher, which is 40.7% above the national average, ranking #132 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in St. Louis County is 76.3 years. 17.1% of adults report poor or fair health and 7.3% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
16.6% of adults in St. Louis County smoke , 33.4% are obese , and 21.6% report excessive drinking. The drug overdose death rate is 40.7 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in St. Louis County is 16.3 per 100,000 and the suicide rate is 14.2 per 100,000. Motor vehicle deaths occur at a rate of 12.2 per 100,000.
Homicide Rate Trend
Families & Children
12.6% of children in St. Louis County live in poverty and the infant mortality rate is 6.0 per 1,000 live births. The teen birth rate is 11.9 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in St. Louis County is 71.8%. The mean commute time is 25.2 min, which is 8.5% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, St. Louis County voted Democratic with a margin of 23.4%. The vote was 60.8% Dem / 37.4% Rep. Compared to 2020, the margin shifted 0.6 toward Republicans .
Vote Share Over Time
About St. Louis County, Missouri
St. Louis County, Missouri has a total population of 995,569, making it the 50th most populous county in the United States. The median age in St. Louis County is 40.3 years, which is 3.6% above the national median of 38.9 years.
The median household income in St. Louis County is $82,936, which ranks #487 of 3,222 counties nationwide. This is 10.4% above the national median of $75,149. The poverty rate is 9.8%, lower than the national rate of 12.6%. The unemployment rate stands at 4.3%.
The median home value in St. Louis County is $276,800, 1.8% below the national median. Renters in St. Louis County pay a median gross rent of $1,209 per month. The homeownership rate is 69.2%, compared to the national rate of 64.4%.
In St. Louis County, 47.4% of residents aged 25 and older hold a bachelor's degree or higher, 40.7% above the national average of 33.7%. Health insurance coverage stands at 94.3% of the population. The average commute time for workers is 25.2 min.
St. Louis County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 61.4% of the population, followed by Black (non-Hispanic) (24.0%) and Two or More Races (5.3%).
All data for St. Louis County, Missouri comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.