Monroe County, Illinois
Located in Illinois, Monroe County has a population of 35,036 residents and a median age of 43.2 years, making it the #1,338 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 5.0%. The median home value is $282,100, and the median household income is $102,880, which is 37% above the national median.
Demographics
Monroe County has a population of 35,036, making it the #1,338 most populous county in the US. The median age is 43.2 years, which is 11.1% 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 Monroe County is $102,880, ranking #147 out of 3,222 counties — 36.9% above the national median. The poverty rate is 5.0% and unemployment stands at 1.9%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Monroe County is $282,100 (+0.1% vs national). Renters pay a median of $1,042/mo and the homeownership rate is 84.7%.
Median Home Value Trend
Rankings →Household Type
Education
In Monroe County, 38.7% of adults age 25+ hold a bachelor's degree or higher, which is 14.7% above the national average, ranking #322 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Monroe County is 79.6 years. 12.3% of adults report poor or fair health and 3.8% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
12.4% of adults in Monroe County smoke , 32.6% are obese , and 24.4% report excessive drinking. The drug overdose death rate is 15.3 per 100,000.
Adult Smoking Trend
Safety
The suicide rate is 9.8 per 100,000. Motor vehicle deaths occur at a rate of 6.6 per 100,000.
Suicide Rate Trend
Families & Children
4.5% of children in Monroe County live in poverty . The teen birth rate is 2.0 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Monroe County is 79.2%. The mean commute time is 30.7 min, which is 11.1% above the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Monroe County voted Republican with a margin of 36.3%. The vote was 31% Dem / 67.3% Rep. Compared to 2020, the margin shifted 0.6 toward Republicans .
Vote Share Over Time
About Monroe County, Illinois
Monroe County, Illinois has a total population of 35,036, making it the 1,338th most populous county in the United States. The median age in Monroe County is 43.2 years, which is 11.1% above the national median of 38.9 years.
The median household income in Monroe County is $102,880, which ranks #147 of 3,222 counties nationwide. This is 36.9% above the national median of $75,149. The poverty rate is 5.0%, lower than the national rate of 12.6%. The unemployment rate stands at 1.9%.
The median home value in Monroe County is $282,100, 0.1% above the national median. Renters in Monroe County pay a median gross rent of $1,042 per month. The homeownership rate is 84.7%, compared to the national rate of 64.4%.
In Monroe County, 38.7% of residents aged 25 and older hold a bachelor's degree or higher, 14.7% above the national average of 33.7%. Health insurance coverage stands at 97.5% of the population. The average commute time for workers is 30.7 min.
Monroe County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 95.0% of the population, followed by Hispanic or Latino (1.9%) and Two or More Races (1.6%).
All data for Monroe 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.