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Kendall County, IL
10 cities and towns and 9 ZIP codes in Kendall County, Illinois.
Population
137,675
Land area
320sq mi
People per sq mi
430
ZIP codes
9
Cities and towns in Kendall County
Kendall County at a glance
- Kendall County is 88% denser than Illinois as a whole.
- By population, it ranks 15th among 102 counties in Illinois.
- The median household income is $111,601, 34% above the Illinois median of $83,390.
- A typical owner-occupied home is valued at $322,400 (22% above Illinois) and median rent is $1,781 a month.
- Its largest cities are Oswego (36,375), Yorkville (23,617) and Montgomery (21,515).
Local data for Kendall County, IL
Counts from official public data
Housing and community stats
Kendall County, IL, American Community Survey 2020-2024
Median household income
$111,601
Poverty rate
5.4%
Median home value
$322,400
Prices +6.9% in a year
Median rent
$1,781/mo
Homeownership
84.0%
Bachelor's or higher
36.9%
Median age
36.3
Average commute
31.6 min
Largest reported origins and ancestries: German Americans (26,706), Mexican Americans (25,734), Irish Americans (16,387).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
3.6%
Sep 2026, -0.6 pts in a year
Average annual pay
$53,553
30,845 jobs, 2025
Income per person
$63,048
BEA, 2024
Federal spending
$604M
FY 2026, $4,578 per person
PPP loans
$247M
5,016 loans, 29,841 jobs reported
Campaign donations
$418K
Itemized, 2026 cycle
How people get to work
Kendall County, IL, workers 16 and older. American Community Survey 5-year estimates
- Drove alone76.5%
- Carpooled6.4%
- Public transit1.0%
- Walked0.6%
- Bicycle0.0%
- Taxi, ride-hailing, motorcycle or other0.7%
- Worked from home14.7%
Average one-way commute: 31.6 minutes for people who do not work from home.
Environment and hazard risk
Kendall County, IL, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Low
Top: cold wave
Storm events since 1996
492
Most often thunderstorm wind
Flood insurance policies
101
0.2% of homes, county
July high / Jan low
84° / 15°F
33.8 inches of rain a year
Hazards, floods and storm historyCheck a flood zone8 historic places
Health statistics
Share of adults in Kendall County, IL, CDC PLACES estimates
Obesity
39.7%
U.S. 33.3% +6.4 pts
Diabetes
9.4%
U.S. 12.1% -2.7 pts
Smoking
11.0%
U.S. 12.8% -1.8 pts
Uninsured (18-64)
8.8%
U.S. 11.1% -2.3 pts
Cities, towns and ZIP codes in Kendall County
Population shown
Frequently asked questions
- What is the largest city in Kendall County, IL?
- Oswego is the largest city or town in Kendall County, with about 36,375 residents.
- How many ZIP codes are in Kendall County?
- Kendall County includes 9 ZIP Code Tabulation Areas, including 60431, 60447, 60512, 60536, 60538.
- What is the population of Kendall County, IL?
- About 137,675 people live in Kendall County, based on American Community Survey 5-year estimates.
- What counties border Kendall County?
- Kendall County borders DuPage County, Will County, Kane County, LaSalle County, DeKalb County, Grundy County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023