Marion County, Illinois
Located in Illinois, Marion County has a population of 37,000 residents and a median age of 41.5 years, making it the #1,284 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 15.4%. The median home value is $103,000, and the median household income is $61,240, which is 19% below the national median.
Demographics
Marion County has a population of 37,000, making it the #1,284 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 Marion County is $61,240, ranking #1,961 out of 3,222 counties — 18.5% below the national median. The poverty rate is 15.4% and unemployment stands at 5.9%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Marion County is $103,000 (-63.5% vs national). Renters pay a median of $794/mo and the homeownership rate is 74.7%.
Median Home Value Trend
Rankings →Household Type
Education
In Marion County, 16.8% of adults age 25+ hold a bachelor's degree or higher, which is 50.3% below the national average, ranking #2,541 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Marion County is 72.4 years. 19.7% of adults report poor or fair health and 6.5% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
20.1% of adults in Marion County smoke , 38.5% are obese , and 20.8% report excessive drinking. The drug overdose death rate is 36.8 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in Marion County is 4.2 per 100,000 and the suicide rate is 23.9 per 100,000. Motor vehicle deaths occur at a rate of 18.7 per 100,000.
Homicide Rate Trend
Families & Children
20.6% of children in Marion County live in poverty and the infant mortality rate is 6.5 per 1,000 live births. The teen birth rate is 37.5 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in Marion County is 60.8%. The mean commute time is 23.1 min, which is 16.4% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Marion County voted Republican with a margin of 49.5%. The vote was 24.6% Dem / 74.1% Rep. Compared to 2020, the margin shifted 2.9 toward Republicans .
Vote Share Over Time
About Marion County, Illinois
Marion County, Illinois has a total population of 37,000, making it the 1,284th most populous county in the United States. The median age in Marion County is 41.5 years, which is 6.7% above the national median of 38.9 years.
The median household income in Marion County is $61,240, which ranks #1,961 of 3,222 counties nationwide. This is 18.5% below the national median of $75,149. The poverty rate is 15.4%, higher than the national rate of 12.6%. The unemployment rate stands at 5.9%.
The median home value in Marion County is $103,000, 63.5% below the national median. Renters in Marion County pay a median gross rent of $794 per month. The homeownership rate is 74.7%, compared to the national rate of 64.4%.
In Marion County, 16.8% of residents aged 25 and older hold a bachelor's degree or higher, 50.3% below the national average of 33.7%. Health insurance coverage stands at 93.6% of the population. The average commute time for workers is 23.1 min.
Marion County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 89.1% of the population, followed by Two or More Races (4.2%) and Black (non-Hispanic) (2.9%).
All data for Marion 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.