Warren County, Illinois
Located in Illinois, Warren County has a population of 16,447 residents and a median age of 38.5 years, making it the #2,075 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 14.6%. The median home value is $105,000, and the median household income is $67,385, which is 10% below the national median.
Demographics
Warren County has a population of 16,447, making it the #2,075 most populous county in the US. The median age is 38.5 years, which is 1.0% below 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 Warren County is $67,385, ranking #1,398 out of 3,222 counties — 10.3% below the national median. The poverty rate is 14.6% and unemployment stands at 3.6%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Warren County is $105,000 (-62.8% vs national). Renters pay a median of $788/mo and the homeownership rate is 75.2%.
Median Home Value Trend
Rankings →Household Type
Education
In Warren County, 22.0% of adults age 25+ hold a bachelor's degree or higher, which is 34.8% below the national average, ranking #1,660 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Warren County is 76.0 years. 19.6% of adults report poor or fair health and 7.2% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
18.1% of adults in Warren County smoke , 37.7% are obese , and 21.0% report excessive drinking.
Adult Smoking Trend
Safety
The suicide rate is 17.2 per 100,000. Motor vehicle deaths occur at a rate of 11.9 per 100,000.
Suicide Rate Trend
Families & Children
16.4% of children in Warren County live in poverty . The teen birth rate is 15.9 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Warren County is 61.7%. The mean commute time is 20.9 min, which is 24.4% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Warren County voted Republican with a margin of 25.1%. The vote was 36.5% Dem / 61.6% Rep. Compared to 2020, the margin shifted 5.1 toward Republicans .
Vote Share Over Time
About Warren County, Illinois
Warren County, Illinois has a total population of 16,447, making it the 2,075th most populous county in the United States. The median age in Warren County is 38.5 years, which is 1.0% below the national median of 38.9 years.
The median household income in Warren County is $67,385, which ranks #1,398 of 3,222 counties nationwide. This is 10.3% below the national median of $75,149. The poverty rate is 14.6%, higher than the national rate of 12.6%. The unemployment rate stands at 3.6%.
The median home value in Warren County is $105,000, 62.8% below the national median. Renters in Warren County pay a median gross rent of $788 per month. The homeownership rate is 75.2%, compared to the national rate of 64.4%.
In Warren County, 22.0% of residents aged 25 and older hold a bachelor's degree or higher, 34.8% below the national average of 33.7%. Health insurance coverage stands at 95.0% of the population. The average commute time for workers is 20.9 min.
Warren County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 81.1% of the population, followed by Hispanic or Latino (11.1%) and Black (non-Hispanic) (2.7%).
All data for Warren County, Illinois 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.