Kendall County, Illinois Demographics 2026
Kendall County, Illinois has a population of 137,675, the 15th most populous county in Illinois. The median household income is $111,601 and the median home value is $322,400. The poverty rate is 5.4%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Kendall County Quick Facts
How Kendall 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 | 135,053 | 137,675 | +1.9% |
| Median household income | $110,474 | $111,601 | +1.0% |
| Median home value | $298,900 | $322,400 | +7.9% |
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 diverse community with significant representation from multiple racial and ethnic groups.
State average: 61 | National average: 61
Education
Educational Attainment (Adults 25+)
Cities & Places in Kendall County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Yorkville | 23,617 | $108,513 | 3.3% | $335,300 |
| Plano | 12,203 | $86,271 | 10.2% | $230,700 |
| Boulder Hill | 8,989 | $80,377 | 8.8% | $238,700 |
| Sandwich | 7,219 | $80,768 | 10.3% | $255,700 |
| Newark | 1,138 | $99,375 | 4.4% | $241,100 |
| Millington | 729 | $81,775 | 7.7% | $230,700 |
| Lisbon | 373 | $99,375 | 1.9% | $231,300 |
| Millbrook | 243 | $137,560 | 4.5% | $361,900 |
| Plattville | 225 | $113,750 | 0.0% | $309,100 |
Explore Illinois Rankings
Population Overview
Kendall County is located in Illinois with a total population of 137,675. It is the 15th most populous county out of 102 in Illinois. The county encompasses 9 Census-designated places.
Age Demographics
The median age in Kendall County is 36.3 years. This is 7% lower than the state median of 39.0 years.
Economy, Income & Housing
The median household income in Kendall County is $111,601. This is 34% higher than the state median of $83,390. It is also 38% higher than the national median of $80,734. The poverty rate stands at 5.4%. This is 54% lower than the state poverty rate of 11.8%. The unemployment rate is 4.3%. This is 26% lower than the state rate of 5.8%. The median home value is $322,400. Housing costs are 22% higher than the state median of $263,300. With a home-value-to-income ratio of just 2.9x, Kendall County is one of the most affordable housing markets in the area. 84.0% of occupied housing units are owner-occupied. This homeownership rate is 25% higher than the state average of 67.1%.
Race & Ethnicity
The largest racial or ethnic group in Kendall County is White (non-Hispanic), making up 62.0% of the population. Hispanic or Latino residents account for 22.4%.
Education
36.9% of residents aged 25 and older hold a bachelor's degree or higher. This places Kendall County in the top 10% of all counties in the state for educational attainment. This is 2% 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 94.0%.
Data Sources & Methodology
All figures for Kendall 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 Kendall County, Illinois?
Kendall County has a population of 137,675, making it the 15th most populous county in Illinois.
What is the median income in Kendall County?
The median household income in Kendall County is $111,601 with a poverty rate of 5.4%.
How many cities are in Kendall County, Illinois?
Kendall County contains 9 Census-designated places.