Clark County, Illinois
Located in Illinois, Clark County has a population of 15,266 residents and a median age of 42.6 years, making it the #2,146 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 9.1%. The median home value is $132,400, and the median household income is $72,927, which is 3% below the national median.
Demographics
Clark County has a population of 15,266, making it the #2,146 most populous county in the US. The median age is 42.6 years, which is 9.5% 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 Clark County is $72,927, ranking #978 out of 3,222 counties — 3.0% below the national median. The poverty rate is 9.1% and unemployment stands at 3.7%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Clark County is $132,400 (-53.0% vs national). Renters pay a median of $861/mo and the homeownership rate is 80.3%.
Median Home Value Trend
Rankings →Household Type
Education
In Clark County, 24.9% of adults age 25+ hold a bachelor's degree or higher, which is 26.1% below the national average, ranking #1,238 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Clark County is 74.9 years. 15.2% of adults report poor or fair health and 5.9% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
14.8% of adults in Clark County smoke , 35.0% are obese , and 22.3% report excessive drinking. The drug overdose death rate is 21.8 per 100,000.
Adult Smoking Trend
Safety
The suicide rate is 17.5 per 100,000. Motor vehicle deaths occur at a rate of 23.9 per 100,000.
Suicide Rate Trend
Families & Children
15.9% of children in Clark County live in poverty . The teen birth rate is 20.6 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Clark County is 69.5%. The mean commute time is 27.2 min, which is 1.6% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Clark County voted Republican with a margin of 51.2%. The vote was 23.5% Dem / 74.7% Rep. Compared to 2020, the margin shifted 0.6 toward Republicans .
Vote Share Over Time
About Clark County, Illinois
Clark County, Illinois has a total population of 15,266, making it the 2,146th most populous county in the United States. The median age in Clark County is 42.6 years, which is 9.5% above the national median of 38.9 years.
The median household income in Clark County is $72,927, which ranks #978 of 3,222 counties nationwide. This is 3.0% below the national median of $75,149. The poverty rate is 9.1%, lower than the national rate of 12.6%. The unemployment rate stands at 3.7%.
The median home value in Clark County is $132,400, 53.0% below the national median. Renters in Clark County pay a median gross rent of $861 per month. The homeownership rate is 80.3%, compared to the national rate of 64.4%.
In Clark County, 24.9% of residents aged 25 and older hold a bachelor's degree or higher, 26.1% below the national average of 33.7%. Health insurance coverage stands at 95.3% of the population. The average commute time for workers is 27.2 min.
Clark County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 95.0% of the population, followed by Two or More Races (2.5%) and Hispanic or Latino (1.9%).
All data for Clark 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.