Kendall County, Illinois Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Kendall 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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A
Health Above averageAmong the top 5 healthiest counties in Illinois
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A
Income Above averageWealthiest county in Illinois
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B
Education Around averageBetter educated than 94% of counties in Illinois
Source: Map AI Methodology
Population: density and quick facts
| Metric | Kendall County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Population | 137,674 | 12,692,444 | 337,468,954 |
| Population density (per sq mi) | 427.5 | 219.1 | 86.4 |
| Population growth (%/yr) | 1.57% | -0.16% | 0.59% |
| Median age | 37.3 | 37.4 | 37.3 |
| Households | 45,372 | 5,035,584 | 130,235,071 |
Population in Kendall County grew by 46.1% from 2009 to 2024, reaching 137,674 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Kendall County is Millennials, aged 29–44, at 24.5% of residents. That is 2.6 points above Illinois as a whole.
- Gen Z 13–28 29,310 21.3% on par
- Millennials 29–44 33,698 24.5% +2.6 pts
- Gen X 45–60 29,341 21.3% +0.9 pts
- Boomers 61–79 15,445 11.2% -5.7 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 50.2% of the people living in Kendall County and men 49.8%.
- Women 50.2% Illinois 50.6%
- Men 49.8% Illinois 49.4%
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Residents matching this profile
100% of everyone living in Kendall County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Kendall County has a the economy index of A, which means it is very prosperous.
| Metric | Kendall County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median household income | $110,609 | $84,042 | $80,455 |
| Income growth (%/yr) | 3.34% | 4.46% | 4.80% |
| Unemployment rate | 4.3% | 5.8% | 5.2% |
The median household income in Kendall County is about 32% higher than in Illinois.
Housing
| Metric | Kendall County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median home price | $332,795 | $149,936 | $248,835 |
| Median rent | $1,780 | $1,274 | $1,407 |
| Homeownership rate | 84.0% | 67.1% | 65.2% |
The median home price in Kendall County is about 15.6 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $1,780 per month for that long.
Commute Time & Mobility
Commuters in Kendall County spend about 61 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 255 hours, about 10.6 full days, spent commuting.
| Metric | Kendall County | Illinois Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 30.6 | 23.6 | 22.4 |
| Round-trip commute (min) | 61.3 | 47.3 | 44.8 |
| Yearly time spent (hours) | 255 | 197 | 187 |
| Estimated yearly cost | $7,912 | $6,104 | $5,790 |
| Work from home | 14.7% | 15.9% | 15.0% |
| Highway traffic (vehicles/day) | 9,443 | 7,977 | 8,813 |
| Local road traffic (vehicles/day) | 2,278 | 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 Kendall County is 31 minutes, longer 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
Kendall County has a education index of B, which means it is quite educated.
| Metric | Kendall County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 33.0% | 34.1% | 31.6% |
| Average household size | 3.03 | 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
Kendall County has a health index of A, which means it is very healthy.
| Metric | Kendall County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 80.0 | 77.9 | 78.3 |
| Self-rated poor health | 10.7% | 15.6% | 16.3% |
| Smokers | 15.5% | 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).
Kendall County, IL Compared With Nearby Counties
Kendall County, IL is the 4th largest of the 6 counties compared here, 137,674 residents against a local median of 517,214. Where Kendall County, IL breaks from the counties next to it is median home price, sitting 54% above the local median of $215,928 at $332,795.
Commute tells the same story from another angle: 30.6 min against a local median of 23.6 min, 30% above it. The one measure here that carries a verdict is commute, and at 30% above the local median it puts Kendall County, IL at the weaker end of the local range. The counties themselves spread $289,688 on median home price, so Kendall County, IL sits at one end of an already wide local range rather than apart from it. Kendall County, IL has the 3rd highest median home price of the 6 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Kendall County, IL | 137,674 | $110,609 #2/6 | $332,795 #3/6 | 30.6 min #6/6 |
| Grundy County, IL | 53,223 | $92,779 | $110,688 | 23.4 min |
| Kane County, IL | 517,214 | $103,524 | $215,928 | 23.8 min |
| DuPage County, IL | 929,812 | $112,172 | $400,376 | 23.6 min |
| DeKalb County, IL | 100,702 | $71,059 | $334,212 | 21.0 min |
| Will County, IL | 701,595 | $109,769 | $214,302 | 28.2 min |
Frequently Asked Questions
Common questions about Kendall County, Illinois.
What is the population of Kendall County, Illinois?
About 137,674 people live in Kendall County, Illinois, in 45,372 households of 3.0 people on average. The median age is 37.3, close to the U.S. median of 37.3.
Is Kendall County, Illinois urban or rural?
Averaged over its land area, Kendall County, Illinois has 427 people per square mile, a density typical of a mix of suburbs, small towns and farmland. That is about 4.9 times the U.S. average of 86.
How affordable is housing in Kendall County, Illinois?
The median home costs 3.0 times the median household income ($332,795 against $110,609), compared with 3.1 times nationally. A ratio of about 3 is traditionally considered affordable. Median rent of $1,780 a month takes about 19% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
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