Marshall County, Illinois
Located in Illinois, Marshall County has a population of 11,647 residents and a median age of 46.1 years, making it the #2,379 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 11.4%. The median home value is $142,800, and the median household income is $71,585, which is 5% below the national median.
Demographics
Marshall County has a population of 11,647, making it the #2,379 most populous county in the US. The median age is 46.1 years, which is 18.5% 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 Marshall County is $71,585, ranking #1,078 out of 3,222 counties — 4.7% below the national median. The poverty rate is 11.4% and unemployment stands at 3.8%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Marshall County is $142,800 (-49.3% vs national). Renters pay a median of $782/mo and the homeownership rate is 79.2%.
Median Home Value Trend
Rankings →Household Type
Education
In Marshall County, 18.0% of adults age 25+ hold a bachelor's degree or higher, which is 46.5% below the national average, ranking #2,353 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Marshall County is 76.3 years. 18.9% of adults report poor or fair health and 5.7% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
18.9% of adults in Marshall County smoke , 37.0% are obese , and 22.1% report excessive drinking. The drug overdose death rate is 31.8 per 100,000.
Adult Smoking Trend
Safety
The suicide rate is 19.7 per 100,000. Motor vehicle deaths occur at a rate of 22.1 per 100,000.
Suicide Rate Trend
Families & Children
15.8% of children in Marshall County live in poverty . The teen birth rate is 19.3 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Marshall County is 69.5%. The mean commute time is 30.0 min, which is 8.8% above the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Marshall County voted Republican with a margin of 36.0%. The vote was 31.2% Dem / 67.2% Rep. Compared to 2020, the margin shifted 1.5 toward Republicans .
Vote Share Over Time
About Marshall County, Illinois
Marshall County, Illinois has a total population of 11,647, making it the 2,379th most populous county in the United States. The median age in Marshall County is 46.1 years, which is 18.5% above the national median of 38.9 years.
The median household income in Marshall County is $71,585, which ranks #1,078 of 3,222 counties nationwide. This is 4.7% below the national median of $75,149. The poverty rate is 11.4%, lower than the national rate of 12.6%. The unemployment rate stands at 3.8%.
The median home value in Marshall County is $142,800, 49.3% below the national median. Renters in Marshall County pay a median gross rent of $782 per month. The homeownership rate is 79.2%, compared to the national rate of 64.4%.
In Marshall County, 18.0% of residents aged 25 and older hold a bachelor's degree or higher, 46.5% below the national average of 33.7%. Health insurance coverage stands at 96.5% of the population. The average commute time for workers is 30.0 min.
Marshall County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 92.1% of the population, followed by Two or More Races (3.7%) and Hispanic or Latino (3.5%).
All data for Marshall 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.