Grundy County, Illinois Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Grundy County, IL Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
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B
Health Around averageHealthier than 89% of counties in Illinois
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B
Income Around averageWealthier than 93% of counties in Illinois
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D
Education Well below averageBetter educated than 75% of counties in Illinois
Source: Map AI Methodology
Population: density and quick facts
| Metric | Grundy County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Population | 53,223 | 12,692,444 | 337,468,954 |
| Population density (per sq mi) | 123.7 | 219.1 | 86.4 |
| Population growth (%/yr) | 0.70% | -0.16% | 0.59% |
| Median age | 35.7 | 37.4 | 37.3 |
| Households | 20,596 | 5,035,584 | 130,235,071 |
Population in Grundy County grew by 14.4% from 2009 to 2024, reaching 53,223 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Grundy County is Millennials, aged 29–44, at 21.7% of residents. That is 0.2 points below Illinois as a whole.
- Gen Z 13–28 11,245 21.1% -0.1 pts
- Millennials 29–44 11,553 21.7% -0.2 pts
- Gen X 45–60 11,535 21.7% +1.3 pts
- Boomers 61–79 7,790 14.6% -2.3 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Illinois, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 49.5% of the people living in Grundy County and men 50.5%.
- Women 49.5% Illinois 50.6%
- Men 50.5% Illinois 49.4%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in Grundy County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Grundy County has a the economy index of B, which means it is quite prosperous.
| Metric | Grundy County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median household income | $92,779 | $84,042 | $80,455 |
| Income growth (%/yr) | 4.20% | 4.46% | 4.80% |
| Unemployment rate | 4.6% | 5.8% | 5.2% |
The median household income in Grundy County is about 10% higher than in Illinois.
Housing
| Metric | Grundy County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median home price | $110,688 | $149,936 | $248,835 |
| Median rent | $1,176 | $1,274 | $1,407 |
| Homeownership rate | 74.4% | 67.1% | 65.2% |
The median home price in Grundy County is about 7.8 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $1,176 per month for that long.
Commute Time & Mobility
Commuters in Grundy County spend about 47 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 195 hours, about 8.1 full days, spent commuting.
| Metric | Grundy County | Illinois Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 23.4 | 23.6 | 22.4 |
| Round-trip commute (min) | 46.8 | 47.3 | 44.8 |
| Yearly time spent (hours) | 195 | 197 | 187 |
| Estimated yearly cost | $6,049 | $6,104 | $5,790 |
| Work from home | 10.0% | 15.9% | 15.0% |
| Highway traffic (vehicles/day) | 8,003 | 7,977 | 8,813 |
| Local road traffic (vehicles/day) | 1,035 | 1,547 | 1,355 |
Fastest commutes among counties in
Illinois:
Edgar County (12.0 min), Brown County (12.7 min), Morgan County (13.1 min).
Slowest:
Calhoun County (43.8 min), Pulaski County (31.2 min), Pope County (31.0 min).
The average commute time in Grundy County is 23 minutes, shorter than the 24 minutes in Illinois.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
Grundy County has a education index of D, which means it is barely educated.
| Metric | Grundy County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 23.6% | 34.1% | 31.6% |
| Average household size | 2.57 | 2.46 | 2.53 |
Highest education index among counties in
Illinois:
DuPage County (0.4), Champaign County (0.4), Lake County (0.4).
Lowest:
Hardin County (0.2), Fayette County (0.2), Perry County (0.2).
Health
Grundy County has a health index of B, which means it is quite healthy.
| Metric | Grundy County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 78.4 | 77.9 | 78.3 |
| Self-rated poor health | 12.2% | 15.6% | 16.3% |
| Smokers | 17.4% | 19.2% | 19.0% |
Highest health index among counties in
Illinois:
DuPage County (0.8), Champaign County (0.8), Monroe County (0.8).
Lowest:
Alexander County (0.8), Pulaski County (0.8), Gallatin County (0.8).
Grundy County, IL Compared With Nearby Counties
Grundy County, IL is the 5th largest of the 6 counties compared here, 53,223 residents against a local median of 108,714. The measure that sets Grundy County, IL apart most is median household income: $92,779, 26% above the local median of $73,875. That is the better end of the local range on this measure.
Median home price tells the same story from another angle: $110,688 against a local median of $136,128, 19% below it. The picture is mixed rather than uniform: median household income runs ahead of the neighbourhood while commute runs behind it, so Grundy County, IL is trading one against the other rather than simply out-performing what surrounds it. The counties themselves spread $38,474 on median household income, so Grundy County, IL sits at one end of an already wide local range rather than apart from it. Grundy County, IL has the 3rd highest median household income of the 6 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Grundy County, IL | 53,223 | $92,779 #3/6 | $110,688 #4/6 | 23.4 min #4/6 |
| Kendall County, IL | 137,674 | $110,609 | $332,795 | 30.6 min |
| Livingston County, IL | 35,565 | $73,875 | $25,250 | 16.1 min |
| Will County, IL | 701,595 | $109,769 | $214,302 | 28.2 min |
| LaSalle County, IL | 108,714 | $73,482 | $97,968 | 18.5 min |
| Kankakee County, IL | 106,635 | $72,136 | $136,128 | 20.0 min |
Frequently Asked Questions
Common questions about Grundy County, Illinois.
How many people live in Grundy County, Illinois?
About 53,223 people live in Grundy County, Illinois, in 20,596 households of 2.6 people on average. The median age is 35.7, so residents are younger than the U.S. median of 37.3 by about 2 years.
Is Grundy County, Illinois mostly urban or rural?
Averaged over its land area, Grundy County, Illinois has 124 people per square mile, a density typical of a mix of suburbs, small towns and farmland. That is close to the U.S. average of 86.
Is Grundy County, Illinois an affordable place to live?
The median home costs 1.2 times the median household income ($110,688 against $92,779), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $1,176 a month takes about 15% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
How common is a college degree in Grundy County, Illinois?
23.6% of adults in Grundy County, Illinois hold a bachelor's degree or higher (about 1 in 4), well below the U.S. share of 31.6%.
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