Clinton County, Illinois
Located in Illinois, Clinton County has a population of 36,954 residents and a median age of 41.5 years, making it the #1,286 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 7.4%. The median home value is $192,400, and the median household income is $86,588, which is 15% above the national median.
Demographics
Clinton County has a population of 36,954, making it the #1,286 most populous county in the US. The median age is 41.5 years, which is 6.7% 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 Clinton County is $86,588, ranking #386 out of 3,222 counties — 15.2% above the national median. The poverty rate is 7.4% and unemployment stands at 3.4%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Clinton County is $192,400 (-31.7% vs national). Renters pay a median of $912/mo and the homeownership rate is 80.3%.
Median Home Value Trend
Rankings →Household Type
Education
In Clinton County, 25.9% of adults age 25+ hold a bachelor's degree or higher, which is 23.3% below the national average, ranking #1,129 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Clinton County is 79.2 years. 16.4% of adults report poor or fair health and 5.7% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
15.7% of adults in Clinton County smoke , 35.3% are obese , and 22.7% report excessive drinking. The drug overdose death rate is 9.0 per 100,000.
Adult Smoking Trend
Safety
The suicide rate is 7.9 per 100,000. Motor vehicle deaths occur at a rate of 18.0 per 100,000.
Suicide Rate Trend
Families & Children
8.8% of children in Clinton County live in poverty . The teen birth rate is 12.0 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Clinton County is 65.5%. The mean commute time is 28.2 min, which is 2.2% above the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Clinton County voted Republican with a margin of 51.9%. The vote was 23.1% Dem / 75% Rep. Compared to 2020, the margin shifted 0.9 toward Republicans .
Vote Share Over Time
About Clinton County, Illinois
Clinton County, Illinois has a total population of 36,954, making it the 1,286th most populous county in the United States. The median age in Clinton County is 41.5 years, which is 6.7% above the national median of 38.9 years.
The median household income in Clinton County is $86,588, which ranks #386 of 3,222 counties nationwide. This is 15.2% above the national median of $75,149. The poverty rate is 7.4%, lower than the national rate of 12.6%. The unemployment rate stands at 3.4%.
The median home value in Clinton County is $192,400, 31.7% below the national median. Renters in Clinton County pay a median gross rent of $912 per month. The homeownership rate is 80.3%, compared to the national rate of 64.4%.
In Clinton County, 25.9% of residents aged 25 and older hold a bachelor's degree or higher, 23.3% below the national average of 33.7%. Health insurance coverage stands at 95.2% of the population. The average commute time for workers is 28.2 min.
Clinton County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 90.1% of the population, followed by Hispanic or Latino (4.1%) and Black (non-Hispanic) (3.1%).
All data for Clinton 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.