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Kendall County is a county in the U.S. state of Illinois, within the Chicago metropolitan area. According to the 2010 census, it has a population of 114,736.[1] Its county seat is Yorkville,[2] and its most populous municipality is Oswego.

Kendall County, Illinois
Yorkville IL Kendall County Courthouse4.JPG
Kendall County Courthouse
Map of Illinois highlighting Kendall County
Location in the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location in the U.S.
Founded 1841
Named for Amos Kendall
Seat Yorkville
Largest village Oswego
 • Total 322 sq mi (834 km2)
 • Land 320 sq mi (829 km2)
 • Water 2.0 sq mi (5 km2), 0.61%
 • (2010) 114,736
 • Density 358/sq mi (138/km²)
Congressional districts 11th, 14th
Time zone Central: UTC-6/-5
Terminal moraines, such as this one in central Kendall County, rise dramatically from the surrounding plain.

Kendall County is included in the Chicago-Naperville-Elgin, IL-IN-WI Metropolitan Statistical Area. It was the fastest-growing county in the United States between the years 2000 and 2010.[3]



Kendall County was formed in 1841 out of LaSalle and Kane counties.

The county is named after Amos Kendall.[4] Kendall was the editor of the Frankfort, Kentucky newspaper, and went on to be an important advisor to President Andrew Jackson. Kendall became the U.S. Postmaster General in 1835.


According to the U.S. Census Bureau, the county has a total area of 322 square miles (830 km2), of which 320 square miles (830 km2) is land and 2.0 square miles (5.2 km2) (0.6%) is water.[5]

Kendall County is a small but rapidly growing county that has the majority of its population in the northeast, and along the Fox River (the only river in the county) which runs through the northwestern section of the county. Many new subdivisions have been constructed in this county, which has produced considerable population growth. Southern Kendall still remains largely agricultural. Kendall County has two primary ranges of low-lying hills formed by what is known as an end moraine. Ransom, the more predominant of the two moraines, runs through the west and north-central part of the county. This moraine has created elevations of over 800 feet (240 m), in contrast to elevations in southern Kendall County that drop to the lower 500 feet (150 m) range. Minooka, the other major end moraine ridge in Kendall County, runs along its entire eastern border with Will County. The two moraines intersect at almost a right angle in the township of Oswego. The county's only designated state park is Silver Springs State Fish and Wildlife Area.

Climate and weatherEdit

Yorkville, Illinois
Climate chart (explanation)
Average max. and min. temperatures in °F
Precipitation totals in inches
Source: The Weather Channel[6]

In recent years, average temperatures in the county seat of Yorkville have ranged from a low of 10 °F (−12 °C) in January to a high of 84 °F (29 °C) in July, although a record low of −26 °F (−32 °C) was recorded in January 1985 and a record high of 111 °F (44 °C) was recorded in July 1936. Average monthly precipitation ranged from 1.52 inches (39 mm) in February to 4.39 inches (112 mm) in July.[6]

Major highwaysEdit

Adjacent countiesEdit


(As of December 2016) County Board members run in two districts. All other officers run county-wide:

  • County Board Members: John P. Purcell,Judy Gilmour, Matthew G. Prochaska, Robert "H.D." Davidson, Audra Hendrix, Elizabeth Flowers, Lynn Cullick, Scott R. Gryder, Matt Kellogg, Tony Giles
  • Scott R. Gryder - County Board Chairman
  • Judy Gilmour - Forest Preserve President
  • Robyn Ingemunson - Clerk of the Circuit Court
  • Jackie Purcell - Coroner
  • Debbie Gillette - County Clerk and Recorder
  • Dwight Baird - Sheriff
  • Eric Weis - State's Attorney
  • Jill Ferko - Treasurer


Census Pop.
1850 7,730
1860 13,074 69.1%
1870 12,399 −5.2%
1880 13,083 5.5%
1890 12,106 −7.5%
1900 11,467 −5.3%
1910 10,777 −6.0%
1920 10,074 −6.5%
1930 10,555 4.8%
1940 11,105 5.2%
1950 12,115 9.1%
1960 17,540 44.8%
1970 26,374 50.4%
1980 37,202 41.1%
1990 39,413 5.9%
2000 54,544 38.4%
2010 114,736 110.4%
Est. 2016 124,695 [7] 8.7%
U.S. Decennial Census[8]
1790-1960[9] 1900-1990[10]
1990-2000[11] 2010-2013[1]
2000 census age pyramid for Kendall County

As of the 2010 United States Census, there were 114,736 people, 38,022 households, and 30,067 families residing in the county.[12] The population density was 358.2 inhabitants per square mile (138.3/km2). There were 40,321 housing units at an average density of 125.9 per square mile (48.6/km2).[5] The racial makeup of the county was 83.6% white, 5.7% black or African American, 3.0% Asian, 0.3% American Indian, 5.0% from other races, and 2.3% from two or more races. Those of Hispanic or Latino origin made up 15.6% of the population.[12] In terms of ancestry, 28.0% were German, 16.0% were Irish, 9.5% were Polish, 9.4% were Italian, 7.5% were English, and 3.2% were American.[13]

Of the 38,022 households, 47.9% had children under the age of 18 living with them, 65.8% were married couples living together, 9.2% had a female householder with no husband present, 20.9% were non-families, and 16.4% of all households were made up of individuals. The average household size was 3.01 and the average family size was 3.41. The median age was 32.9 years.[12]

The median income for a household in the county was $79,897 and the median income for a family was $87,309. Males had a median income of $64,048 versus $42,679 for females. The per capita income for the county was $30,565. About 2.9% of families and 3.9% of the population were below the poverty line, including 4.6% of those under age 18 and 3.4% of those age 65 or over.[14] It is one of seven out of the 364 largest counties in the United States that has a higher median income for African Americans than White Americans.[15]

Kendall County was listed as the fastest-growing county in the US from 2000 to 2009, experiencing a population growth rate of 110.4% in this period.[16] The reason for this growth is heavy suburbanization stemming from the metropolitan Chicago area.


The northern half of the county is in Community College District 516 and is served by Waubonsee Community College in Sugar Grove, Aurora, and Plano. The southern half is in Community College District 525 and is served by Joliet Junior College in Joliet.[17]




Census-designated placeEdit

Other unincorporated communitiesEdit


The county is an 18-mile (29 km) square which is divided up into 9 townships. Each township is divided into 36 1 mile square sections, except that the Fox River is used as a Township border, resulting in Bristol being the smallest township with the extra area being assigned to Oswego and Kendall Townships. There are also two exceptions to the section grid to reflect Indian land grants under the Treaty of Prairie du Chien in 1829: the Mo-Ah-Way Reservation in Oswego Township and the Waish-Kee-shaw Reservation in Na-Au-Say Township. These areas were eventually sold to European settlers.[18]

In popular cultureEdit

Various locations within and around the City of Plano was used as a stand-in for Clark Kent's hometown of Smallville, Kansas in the 2013 film Man of Steel as well as the 2016 film Batman v. Superman: Dawn of Justice. Plano has also been used in the film Witless Protection, with both films having been filmed in Plano's historic downtown area. Filming has also been done south of Plano at the Farnsworth House, a Modern architectural landmark for various documentaries and commercials.

See alsoEdit


  1. ^ a b "State & County QuickFacts". United States Census Bureau. Retrieved July 6, 2014. 
  2. ^ "Find a County". National Association of Counties. Archived from the original on 2011-05-31. Retrieved 2011-06-07. 
  3. ^ "Population Distribution and Change: 2000 to 2010" (PDF). United States Census Bureau. March 2011. p. 9. Retrieved 2011-03-26. 
  4. ^ Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 173. 
  5. ^ a b "Population, Housing Units, Area, and Density: 2010 - County". United States Census Bureau. Retrieved 2015-07-12. 
  6. ^ a b "Monthly Averages for Yorkville, Illinois". The Weather Channel. Retrieved 2011-01-27. 
  7. ^ "Population and Housing Unit Estimates". Retrieved June 9, 2017. 
  8. ^ "U.S. Decennial Census". United States Census Bureau. Archived from the original on May 12, 2015. Retrieved July 6, 2014. 
  9. ^ "Historical Census Browser". University of Virginia Library. Retrieved July 6, 2014. 
  10. ^ "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved July 6, 2014. 
  11. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Retrieved July 6, 2014. 
  12. ^ a b c "DP-1 Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data". United States Census Bureau. Retrieved 2015-07-12. 
  13. ^ "DP02 SELECTED SOCIAL CHARACTERISTICS IN THE UNITED STATES – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Retrieved 2015-07-12. 
  14. ^ "DP03 SELECTED ECONOMIC CHARACTERISTICS – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Retrieved 2015-07-12. 
  15. ^
  16. ^ "2010 US Census Brief" (PDF). Retrieved 8 May 2012. 
  17. ^ retrieved 2007-02-13
  18. ^ Place Names & Geological Features of Kendall County
  • Forstall, Richard L. (editor) (1996). Population of states and counties of the United States: 1790 to 1990 : from the twenty-one decennial censuses. United States Department of Commerce, Bureau of the Census, Population Division. ISBN 0-934213-48-8. 

External linksEdit