County · Illinois
Kendall County, Illinois
Kendall County, Illinois. Kendall County had 145,470 residents in 2025 by the Census Bureau's estimate, up 10.3% since 2020, while Illinois shrank 0.8%. It holds 24 places (14 cities, villages and boroughs, 9 towns and townships and 1 census-designated) and 21 census tracts. GEOID 17093.
Kendall County is one of the 13 counties of the Chicago-Naperville-Elgin, IL-IN metropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
145,470
Census Bureau estimate (no margin published)
2020 Census count: 131,869 · ACS 2020-2024: 137,675
Median household income
$111,601
±$3,257 (90% margin)
Illinois: $83,390
Median home value
$322,400
±$5,720 (90% margin)
Illinois: $263,300
Median gross rent
$1,781
±$76 (90% margin)
Illinois: $1,274
How many people live in Kendall County, and is it growing?
The 2020 Census counted 131,869 residents in Kendall County. The Census Bureau estimates 145,470 for July 1, 2025, up 10.3% since 2020, while Illinois shrank 0.8%. The 2020-2024 American Community Survey puts the population at 137,675 over 320 square miles of land.
| Measure | Kendall County | Illinois | Change since 2015-2019 |
|---|---|---|---|
| Total population | 137,675 | 12,694,798 | +11,621 |
| Households | 45,372±356 | 5,036,449 | +4,651 |
| Average household size | 3.03±0.02 | 2.46 | −0.06 |
| Housing units | 46,589±75 | 5,457,452 | +4,560 |
Kendall County's population since 2000
From 54,544 in 2000 to 145,470 in 2025: up 166.7%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Kendall County?
Kendall County holds 24 places: 14 cities, villages and boroughs (incorporated places), 9 towns and townships (county subdivisions with their own government) and 1 census-designated place. The largest is Oswego Township with 61,778 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Oswego Township | 55,771 | $114,047 |
|---|---|---|
| Oswego | 34,585 | $123,792 |
| Bristol Township | 32,030 | $109,481 |
| Yorkville | 21,533 | $108,513 |
| Joliet | 150,362 | $92,201 |
| Little Rock Township | 14,036 | $87,011 |
| Montgomery | 20,262 | $103,734 |
| Plano | 11,847 | $86,271 |
| Na-Au-Say Township | 10,771 | $127,857 |
| Kendall Township | 8,532 | $121,740 |
| Boulder Hill | 8,394 | $80,377 |
| Seward Township, Kendall County | 6,655 | $121,548 |
| Aurora | 180,542 | $93,633 |
| Plainfield | 44,762 | $144,000 |
| Fox Township, Kendall County | 1,681 | $116,250 |
| Big Grove Township | 1,622 | $115,156 |
| Minooka | 12,758 | $115,445 |
| Newark | 973 | $99,375 |
| Lisbon Township | 771 | $88,750 |
| MillbrookGEOID 1749100 | 277 | $137,560 |
| LisbonGEOID 1743900 | 271 | $99,375 |
| PlattvilleGEOID 1760391 | 220 | $113,750 |
| Millington | 617 | $81,775 |
| Sandwich | 7,221 | $80,768 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Kendall County?
The median resident of Kendall County is 36.3 years old; 27.0% are under 18 and 11.2% are 65 or older. The largest group is non-Hispanic white residents at 62.0%, then Hispanic or Latino residents (of any race) at 22.4%. 11.4% of residents were born outside the United States.
| Measure | Kendall County | Illinois | Change since 2015-2019 |
|---|---|---|---|
| Median age | 36.3±0.3 | 39.0 | +1.1 |
| Under 18 years | 27.0% | 21.8% | – |
| 65 years and over | 11.2% | 17.0% | – |
| Hispanic or Latino (any race) | 22.4% | 18.8% | +3.7 pts |
| White alone, not Hispanic | 62.0%±0.4 pts | 58.1% | −7.5 pts |
| Black or African American alone, not Hispanic | 7.6%±0.4 pts | 13.3% | +0.6 pts |
| Asian alone, not Hispanic | 3.5%±0.3 pts | 5.9% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.1 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 3.9%±0.6 pts | 3.4% | – |
| Some other race alone, not Hispanic | 0.4%±0.3 pts | 0.4% | – |
| Born outside the United States | 11.4%±1.1 pts | 14.7% | +1.9 pts |
| Speak a language other than English at home (age 5+) | 21.8%±1.5 pts | 24.0% | – |
| Civilian veterans (age 18+) | 4.5%±0.5 pts | 4.8% | – |
| With a disability | 8.2%±0.8 pts | 12.1% | – |
| No health insurance coverage | 4.0%±0.6 pts | 6.9% | no clear change |
| High school graduate or higher (age 25+) | 94.0%±0.8 pts | 90.5% | – |
| Bachelor's degree or higher (age 25+) | 36.9%±1.7 pts | 37.8% | no clear change |
| Graduate or professional degree (age 25+) | 12.7%±1.3 pts | 15.3% | – |
| Moved from another state in the past year | 0.5%±0.2 pts | 1.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Kendall County earn?
Half of Kendall County's 45,372 households earn less than $111,601 a year (±$3,257), against $83,390 in Illinois. In 2015-2019 the median was $118,839 in 2024 dollars, so it fell by $7,238 after inflation. 5.4% of residents live below the poverty line.
| Measure | Kendall County | Illinois | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $111,601±$3,257 | $83,390 | −$7,238 |
| Mean household income | $129,379±$3,883 | $115,638 | – |
| Per capita income | $44,141±$1,261 | $46,406 | no clear change |
| People below the poverty line | 5.4%±0.9 pts | 11.8% | no clear change |
| Children under 18 below the poverty line | 7.3%±1.9 pts | 15.1% | no clear change |
| Households receiving SNAP | 8.6%±1.6 pts | 13.8% | – |
| Households with a broadband subscription | 95.6%±1.1 pts | 90.8% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Kendall County?
Owners occupy 84.0% of Kendall County's occupied homes and renters 16.0%. The median owner-occupied home is valued at $322,400 by its owner (±$5,720). The median renter pays $1,781 a month including utilities, and 36.1% of renters pay 35% or more of their income on rent.
| Measure | Kendall County | Illinois | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $322,400±$5,720 | $263,300 | +$32,449 |
| Median gross rent | $1,781±$76 | $1,274 | no clear change |
| Renters paying 35% or more of income on rent | 36.1%±6.4 pts | 39.0% | no clear change |
| Median monthly owner costs, with a mortgage | $2,264±$50 | $1,987 | – |
| Owner-occupied homes | 84.0%±1.7 pts | 67.1% | no clear change |
| Housing units | 46,589±75 | 5,457,452 | +4,560 |
| Homeowner vacancy rate | 0.8%±0.5 pts | 1.0% | – |
| Rental vacancy rate | 2.8%±2.3 pts | 5.0% | – |
| Single-family detached homes | 73.9%±1.8 pts | 58.2% | – |
| Mobile homes | 0.2%±0.2 pts | 2.3% | – |
| Built 2020 or later | 3.1%±0.6 pts | 0.7% | – |
| Built 1939 or earlier | 4.0%±0.8 pts | 20.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Kendall County building?
Builders took permits for 733 new housing units across Kendall County in 2025 (567 single-family), 5.0 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Kendall County get to work?
76.5% of Kendall County's workers drive alone and 14.7% work from home. The average trip to work takes 31.6 minutes. The unemployment rate in 2020-2024 averaged 4.3%.
| Measure | Kendall County | Illinois | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 72.7%±1.3 pts | 65.0% | – |
| Unemployment rate | 4.3%±0.7 pts | 5.8% | no clear change |
| Drove alone to work | 76.5%±1.5 pts | 65.9% | – |
| Carpooled | 6.4%±0.9 pts | 7.8% | – |
| Public transportation | 1.0%±0.4 pts | 5.8% | – |
| Walked | 0.6%±0.3 pts | 2.8% | – |
| Worked from home | 14.7%±1.3 pts | 15.9% | +9.0 pts |
| Mean travel time to work | 31.6 min±0.9 | 27.8 min | −2.8 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Kendall County's census tracts?
Kendall County is divided into 21 census tracts. Among those with a reliable estimate, median household income runs from $75,225 (Tract 8902.01) to $160,664 (Tract 8901.08).
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Kendall County compare with Illinois's other counties?
| Measure | Rank |
|---|---|
| Population | 15th of 102 |
| Growth 2020-2025 | 1st of 102 |
| Residents per square mile | 8th of 102 |
| Median household income | 2nd of 102 |
| Median home value | 5th of 102 |
| Median gross rent | 1st of 102 |
| Poverty rate | 101st of 102 |
| Bachelor's degree or higher | 9th of 102 |
| Median age | 97th of 102 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Kendall County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.