Grundy County, Illinois
Located in Illinois, Grundy County has a population of 53,219 residents and a median age of 38.3 years, making it the #973 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 6.0%. The median home value is $271,700, and the median household income is $92,235, which is 23% above the national median.
Demographics
Grundy County has a population of 53,219, making it the #973 most populous county in the US. The median age is 38.3 years, which is 1.5% below 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 Grundy County is $92,235, ranking #263 out of 3,222 counties — 22.7% above the national median. The poverty rate is 6.0% and unemployment stands at 4.6%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Grundy County is $271,700 (-3.6% vs national). Renters pay a median of $1,177/mo and the homeownership rate is 74.4%.
Median Home Value Trend
Rankings →Household Type
Education
In Grundy County, 23.6% of adults age 25+ hold a bachelor's degree or higher, which is 30.1% below the national average, ranking #1,420 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Grundy County is 76.5 years. 14.6% of adults report poor or fair health and 4.7% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
13.2% of adults in Grundy County smoke , 35.1% are obese , and 22.4% report excessive drinking. The drug overdose death rate is 29.9 per 100,000.
Adult Smoking Trend
Safety
The suicide rate is 16.4 per 100,000. Motor vehicle deaths occur at a rate of 13.6 per 100,000.
Suicide Rate Trend
Families & Children
8.6% of children in Grundy County live in poverty and the infant mortality rate is 5.3 per 1,000 live births. The teen birth rate is 9.4 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in Grundy County is 71.8%. The mean commute time is 29.5 min, which is 6.9% above the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Grundy County voted Republican with a margin of 29.5%. The vote was 34.5% Dem / 64% Rep. Compared to 2020, the margin shifted 3.7 toward Republicans .
Vote Share Over Time
About Grundy County, Illinois
Grundy County, Illinois has a total population of 53,219, making it the 973rd most populous county in the United States. The median age in Grundy County is 38.3 years, which is 1.5% below the national median of 38.9 years.
The median household income in Grundy County is $92,235, which ranks #263 of 3,222 counties nationwide. This is 22.7% above the national median of $75,149. The poverty rate is 6.0%, lower than the national rate of 12.6%. The unemployment rate stands at 4.6%.
The median home value in Grundy County is $271,700, 3.6% below the national median. Renters in Grundy County pay a median gross rent of $1,177 per month. The homeownership rate is 74.4%, compared to the national rate of 64.4%.
In Grundy County, 23.6% of residents aged 25 and older hold a bachelor's degree or higher, 30.1% below the national average of 33.7%. Health insurance coverage stands at 96.6% of the population. The average commute time for workers is 29.5 min.
Grundy County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 82.4% of the population, followed by Hispanic or Latino (12.0%) and Two or More Races (2.4%).
All data for Grundy 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.