County Maps US

Kendall County, Illinois

A county in Illinois, ranked 14 of 102 by population.

CountyFIPS 17093

Within Illinois
Kendall County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Yorkville, the county seat, located via the 2025 Census Gazetteer.

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Population
145,470
+13,106 (+9.9%) since 2020
Land area
320.2
square miles. A further 0.6% of the total area is water
Population density
454
people per square mile, computed rather than published
County seat
Yorkville
Seat of county government.
Established
1841
184 years ago
Largest city
Oswego village
Population 39,948 for the whole place, which extends beyond this county.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Kendall County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Kendall County, Illinois from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 787 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Kendall County ranks

Position among the 102 counties of Illinois, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn IllinoisNationally
Population145,47014th of 102471st of 3,144
Land area320.2 sq mi89th of 1022,761st of 3,144
Population density454 per sq mi8th of 102312th of 3,144
Median household income$111,6012nd of 10284th of 3,143

Full data for Kendall County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population145,470Vintage 2025 Population Estimates
Population in 2020132,364Vintage 2025 Population Estimates
2020 estimates base?131,876Vintage 2025 Population Estimates
Land area320.2 sq mi2025 Gazetteer Files
Water area2.0 sq mi2025 Gazetteer Files
Total area322.2 sq mi2025 Gazetteer Files
Population density?454 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$111,601American Community Survey 2020-2024 5-Year Estimates
Median home value$322,400American Community Survey 2020-2024 5-Year Estimates
Median age36.3American Community Survey 2020-2024 5-Year Estimates
Households45,372American Community Survey 2020-2024 5-Year Estimates
Housing units46,589American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+782
1,480 births, 698 deaths
Net migration
+1,567
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Kendall County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Will CountyIllinois18 mi712,253
Grundy CountyIllinois18 mi54,052
Kane CountyIllinois18 mi525,757
LaSalle CountyIllinois12 mi107,773
DeKalb CountyIllinois6.2 mi101,835
DuPage CountyIllinois184 ft934,298

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 102 counties of Illinois

Open the interactive Illinois county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.