Johnson County, Illinois
Located in Illinois, Johnson County has a population of 13,376 residents and a median age of 41.4 years, making it the #2,264 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 17.6%. The median home value is $160,500, and the median household income is $62,528, which is 17% below the national median.
Demographics
Johnson County has a population of 13,376, making it the #2,264 most populous county in the US. The median age is 41.4 years, which is 6.4% 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 Johnson County is $62,528, ranking #1,844 out of 3,222 counties — 16.8% below the national median. The poverty rate is 17.6% and unemployment stands at 3.5%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Johnson County is $160,500 (-43.1% vs national). Renters pay a median of $781/mo and the homeownership rate is 82.0%.
Median Home Value Trend
Rankings →Household Type
Education
In Johnson County, 19.6% of adults age 25+ hold a bachelor's degree or higher, which is 42.0% below the national average, ranking #2,081 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Johnson County is 75.8 years. 19.0% of adults report poor or fair health and 6.9% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
17.5% of adults in Johnson County smoke , 36.5% are obese , and 21.1% report excessive drinking.
Adult Smoking Trend
Safety
. Motor vehicle deaths occur at a rate of 14.5 per 100,000.
Motor Vehicle Deaths Trend
Families & Children
16.5% of children in Johnson County live in poverty . The teen birth rate is 22.4 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Johnson County is 64.3%. 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, Johnson County voted Republican with a margin of 58.3%. The vote was 20.3% Dem / 78.6% Rep. Compared to 2020, the margin shifted +0.2 toward Democrats .
Vote Share Over Time
About Johnson County, Illinois
Johnson County, Illinois has a total population of 13,376, making it the 2,264th most populous county in the United States. The median age in Johnson County is 41.4 years, which is 6.4% above the national median of 38.9 years.
The median household income in Johnson County is $62,528, which ranks #1,844 of 3,222 counties nationwide. This is 16.8% below the national median of $75,149. The poverty rate is 17.6%, higher than the national rate of 12.6%. The unemployment rate stands at 3.5%.
The median home value in Johnson County is $160,500, 43.1% below the national median. Renters in Johnson County pay a median gross rent of $781 per month. The homeownership rate is 82.0%, compared to the national rate of 64.4%.
In Johnson County, 19.6% of residents aged 25 and older hold a bachelor's degree or higher, 42.0% below the national average of 33.7%. Health insurance coverage stands at 91.9% of the population. The average commute time for workers is 30.0 min.
Johnson County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 80.1% of the population, followed by Black (non-Hispanic) (7.8%) and Two or More Races (7.2%).
All data for Johnson 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.