Grundy County, Illinois Demographics 2026
Grundy County, Illinois has a population of 53,219, the 26th most populous county in Illinois. The median household income is $92,235 and the median home value is $271,700. The poverty rate is 6.0%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Grundy County Quick Facts
How Grundy County Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 52,920 | 53,219 | +0.6% |
| Median household income | $93,060 | $92,235 | -0.9% |
| Median home value | $259,200 | $271,700 | +4.8% |
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 61 | National average: 61
Education
Educational Attainment (Adults 25+)
Cities & Places in Grundy County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Morris | 14,898 | $76,711 | 7.7% | $247,400 |
| Dwight | 3,872 | $71,184 | 11.8% | $155,600 |
| Gardner | 1,410 | $88,092 | 16.1% | $199,600 |
| Mazon | 1,401 | $73,750 | 9.6% | $207,700 |
| South Wilmington | 600 | $86,750 | 5.7% | $174,400 |
| Carbon Hill | 441 | $103,125 | 5.9% | $238,600 |
| Verona | 272 | $45,313 | 18.0% | $118,800 |
| Kinsman | 84 | $53,750 | 11.9% | $103,100 |
| East Brooklyn | 50 | $83,750 | 16.0% | $232,100 |
Explore Illinois Rankings
Population Overview
Grundy County is located in Illinois with a total population of 53,219. It is the 26th most populous county out of 102 in Illinois. The county encompasses 9 Census-designated places.
Age Demographics
The median age in Grundy County is 38.3 years. This is 2% lower than the state median of 39.0 years.
Economy, Income & Housing
The median household income in Grundy County is $92,235. This is 11% higher than the state median of $83,390. It is also 14% higher than the national median of $80,734. The poverty rate stands at 6.0%. This is 49% lower than the state poverty rate of 11.8%. The unemployment rate is 4.6%. This is 22% lower than the state rate of 5.8%. The median home value is $271,700. Housing costs are 3% higher than the state median of $263,300. With a home-value-to-income ratio of just 2.9x, Grundy County is one of the most affordable housing markets in the area. 74.4% of occupied housing units are owner-occupied. This homeownership rate is 11% higher than the state average of 67.1%.
Race & Ethnicity
The largest racial or ethnic group in Grundy County is White (non-Hispanic), making up 82.5% of the population. Hispanic or Latino residents account for 12.0%. The Black or African American population (2.3%) is well below the state average of 13.3%. The Asian population (0.6%) is well below the state average of 5.9%.
Education
23.6% of residents aged 25 and older hold a bachelor's degree or higher. This is 38% lower than the state rate of 37.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 93.8%.
Data Sources & Methodology
All figures for Grundy County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Illinois and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.
Frequently Asked Questions
What is the population of Grundy County, Illinois?
Grundy County has a population of 53,219, making it the 26th most populous county in Illinois.
What is the median income in Grundy County?
The median household income in Grundy County is $92,235 with a poverty rate of 6.0%.
How many cities are in Grundy County, Illinois?
Grundy County contains 9 Census-designated places.