Kendall County, Illinois Population 2026

Updated April 2026 · US Census ACS 2023 5-Year Estimates · 15th-largest in Illinois

The population of Kendall County, Illinois is 135,053 as of the 2023 American Community Survey, making it the 15th-largest county in Illinois. The median household income is $110,474, the median home value is $298,900, and the median age is 36.0.

The population of Kendall County has grown 24.1% since 2010 (115,369 → 143,171), a +1.55% annualized rate.

Kendall County within Illinois · Source: US Census TIGER/Line via us-atlas

135,053

Population

+1.55%

Annual growth

422

People / sq mi

$110,474

Median Income

$298,900

Median Home Value

Kendall County covers 320 sq mi of land at 421.7 people per square mile.

About Kendall County, IL

Among US counties, Kendall County stands out first on household income: a median of $110,474, above the US median of $78,538. With 135,053 residents, Kendall County is a county in Illinois. It ranks #15 among counties in Illinois by population.

Households here are among the highest-earning of all US counties: median income is $110,474, above the US median of $78,538. Very few residents live in poverty — 3.8%, below the national 12.4%. Home values run above average at $298,900, with typical rent around $1,763.

Educational attainment is on the higher side for US counties — 36.4% of adults hold a four-year degree, near the national 35.0%. Remote work is on the higher side at 13.6%, close to the national 14.0%, and the average commute runs about 33 minutes each way.

Taken together, the income and housing figures place Kendall County firmly in the higher-cost, higher-earning tier of US counties — a profile that tends to track dense job markets and competitive housing.

Kendall County Population History (2010-2024)

The county of Kendall County had a population of 115,369 in 2010 and 143,171 in 2024, a 24.1% growth over 14 years. The peak was 143,171 in 2024. Average annual growth rate: 1.56%.

Kendall County population, 2010–2024 · Source: U.S. Census Bureau — decennial census & Population Estimates

143,171

Population (2024)

115,369

Population (2010)

143,171

Peak (2024)

1.56%

Avg Annual Growth

Year	Population	Change	Annual %	Source
2010	115,369	-	-	estimate
2011	116,817	+1,448	+1.26%	estimate
2012	118,255	+1,438	+1.23%	estimate
2013	119,582	+1,327	+1.12%	estimate
2014	121,385	+1,803	+1.51%	estimate
2015	122,892	+1,507	+1.24%	estimate
2016	124,549	+1,657	+1.35%	estimate
2017	126,163	+1,614	+1.30%	estimate
2018	127,663	+1,500	+1.19%	estimate
2019	128,900	+1,237	+0.97%	estimate
2020	132,351	+3,451	+2.68%	estimate
2021	135,023	+2,672	+2.02%	estimate
2022	137,602	+2,579	+1.91%	estimate
2023	140,229	+2,627	+1.91%	estimate
2024	143,171	+2,942	+2.10%	estimate

Race & Ethnicity

White	69.1%
Black or African American	8.3%
Asian	0.0%
Hispanic or Latino (any race)	1.0%
Two or More Races	0.0%

Age & Sex

36.0

Median Age

50.1%

Female

49.9%

Male

11.0%

Age 65+

Age Distribution

Under 5

6.2%

5–9

8.6%

10–14

7.4%

15–19

7.9%

20–24

5.6%

25–34

12.5%

35–44

16.1%

45–54

14.3%

55–59

5.9%

60–64

4.3%

65–74

6.9%

75–84

3.1%

85+

1.0%

Children (under 15): 22.2% · Seniors (65+): 11.0%

Income & Poverty

Median household income	$110,474+$28,772 vs state
Mean household income	$127,433
Per-capita income	$43,127
Poverty rate	3.8%-4.4% vs state
Unemployment rate	2.6%
Employment-to-population	70.0%

Top Industries by Employment

Professional & business services

24.4%

Finance & real estate

11.0%

Manufacturing

9.9%

Education & health care

8.4%

Retail trade

7.7%

Construction

7.0%

Information

6.4%

Public administration

3.6%

The largest employment sector in Kendall County is professional & business services, accounting for 24.4% of workers.

How residents commute

1.0%

Drive alone

0.4%

Carpool

77.4%

Public transit

13.6%

Work from home

32.9 min

Avg commute

Housing

$298,900+$48,400 vs state

Median home value

$1,763

Median rent

84.2%

Homeownership rate

45,775

Total housing units

97.3%

Occupied

2.7%

Vacant

15.8%

Renter-occupied

Social & access

95.6%

With health insurance

98.3%

With broadband internet

13.8%

Foreign-born

4.1%

Veterans (18+)

7.7%

With a disability

79.0%

Speak language other than English at home

Education

93.6%

High School+

36.4%

Bachelor's+

Largest cities in Illinois

Chicago (2,707,648)Aurora (179,867)Joliet (149,785)Naperville (149,424)Rockford (147,649)Elgin (114,106)Springfield (113,714)Peoria (112,126)Waukegan (88,919)Champaign (88,822)All Illinois cities →

Other counties in Illinois

Cook County (5,185,812)DuPage County (927,263)Lake County (711,885)Will County (698,450)Kane County (516,097)McHenry County (311,366)Winnebago County (283,289)Madison County (264,631)St. Clair County (254,777)Champaign County (206,098)All Illinois counties →

Part of Illinois

Illinois demographic profile All Illinois data →

Metro areas in Illinois

Chicago (9,359,555)St. Louis (2,809,414)Davenport (381,864)Peoria (365,773)Rockford (336,605)Champaign (236,196)Springfield (207,386)Bloomington (170,882)All US metros →

County rankings

US Counties by Population Richest US Counties by Median Household Income Expensive US Counties by Home Value Educated US Counties Counties With Highest Poverty Rates Youngest US Counties by Median Age Oldest US Counties by Median Age Cheapest US Counties by Median Home Value Racially Diverse US Counties Counties With Largest Hispanic Population All rankings →

Frequently Asked Questions

Kendall County, Illinois has a population of 135,053 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 15th-largest county in Illinois. Population density is 422 people per square mile.

The population of Kendall County has grown 24.1% since 2010 (115,369 → 143,171), a +1.55% annualized rate.

The median household income in Kendall County, Illinois is $110,474, with mean (average) household income of $127,433 and per-capita income of $43,127. 3.8% of residents live below the federal poverty level.

In Kendall County, the largest racial and ethnic groups are White (69.1%), Black or African American (8.3%), Hispanic or Latino (1.0%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.

The median age in Kendall County, Illinois is 36.0 years. Residents are 50.1% female and 49.9% male.

The median home value in Kendall County is $298,900 and median monthly rent is $1,763. 84.2% of occupied housing units are owner-occupied. The county has 45,775 total housing units, 2.7% of which are vacant.

The largest employment sector in Kendall County, Illinois is professional, scientific, and management services, employing 24.4% of workers. The unemployment rate is 2.6%.

Chicago is among the largest cities associated with Kendall County, Illinois, with a population of 2,707,648.