Washington County, Illinois
Located in Illinois, Washington County has a population of 13,627 residents and a median age of 44.2 years, making it the #2,252 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 7.5%. The median home value is $155,700, and the median household income is $78,224, which is 4% above the national median.
Demographics
Washington County has a population of 13,627, making it the #2,252 most populous county in the US. The median age is 44.2 years, which is 13.6% 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 Washington County is $78,224, ranking #661 out of 3,222 counties — 4.1% above the national median. The poverty rate is 7.5% and unemployment stands at 4.3%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Washington County is $155,700 (-44.8% vs national). Renters pay a median of $818/mo and the homeownership rate is 84.1%.
Median Home Value Trend
Rankings →Household Type
Education
In Washington County, 23.5% of adults age 25+ hold a bachelor's degree or higher, which is 30.3% below the national average, ranking #1,433 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Washington County is 77.1 years. 15.7% of adults report poor or fair health and 4.8% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
16.5% of adults in Washington County smoke , 35.8% are obese , and 22.9% report excessive drinking. The drug overdose death rate is 26.8 per 100,000.
Adult Smoking Trend
Safety
The suicide rate is 22.0 per 100,000. Motor vehicle deaths occur at a rate of 23.7 per 100,000.
Suicide Rate Trend
Families & Children
10.5% of children in Washington County live in poverty . The teen birth rate is 15.7 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Washington County is 72.1%. The mean commute time is 28.4 min, which is 3.0% above the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Washington County voted Republican with a margin of 57.2%. The vote was 20.7% Dem / 77.9% Rep. Compared to 2020, the margin shifted 0.7 toward Republicans .
Vote Share Over Time
About Washington County, Illinois
Washington County, Illinois has a total population of 13,627, making it the 2,252nd most populous county in the United States. The median age in Washington County is 44.2 years, which is 13.6% above the national median of 38.9 years.
The median household income in Washington County is $78,224, which ranks #661 of 3,222 counties nationwide. This is 4.1% above the national median of $75,149. The poverty rate is 7.5%, lower than the national rate of 12.6%. The unemployment rate stands at 4.3%.
The median home value in Washington County is $155,700, 44.8% below the national median. Renters in Washington County pay a median gross rent of $818 per month. The homeownership rate is 84.1%, compared to the national rate of 64.4%.
In Washington County, 23.5% of residents aged 25 and older hold a bachelor's degree or higher, 30.3% below the national average of 33.7%. Health insurance coverage stands at 96.6% of the population. The average commute time for workers is 28.4 min.
Washington County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 94.8% of the population, followed by Two or More Races (2.0%) and Hispanic or Latino (1.6%).
All data for Washington 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.