Kendall County, Illinois

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Kendall County, Illinois
Yorkville IL Kendall County Courthouse4.JPG
Kendall County Courthouse
Map of Illinois highlighting Kendall County
Location in the 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 322.32 sq mi (835 km2)
 • Land 320.34 sq mi (830 km2)
 • Water 1.98 sq mi (5 km2), 0.61%
 • (2010) 114,736
 • Density 358/sq mi (66/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 a county located in the U.S. state of Illinois, about 40 miles southwest of Chicago. According to the 2010 census, it has a population of 114,736, which is an increase of 110% from 54,544 in 2000.[1] It was the fastest-growing county in the United States between the years 2000 and 2010.[2] Its county seat is Yorkville.[3] According to the 2010 Census, the largest city in the county is Oswego, Illinois with a 2010 Census population of 30,355.

Kendall County is included in the Chicago metropolitan area.


According to Census statistics, According to the 2010 census, the county has a total area of 322.32 square miles (834.8 km2), of which 320.34 square miles (829.7 km2) (or 99.39%) is land and 1.98 square miles (5.1 km2) (or 0.61%) is water.[4]

Major highways[edit]

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 only designated state park in the county is Silver Springs State Fish and Wildlife Area.

Township 2010 Census population[edit]

  • Big Grove 1,647
  • Bristol 26,230
  • Fox 1,675
  • Kendall 7,739
  • Lisbon 899
  • Little Rock 13,076
  • Na-Au-Say 8,145
  • Oswego 50,870
  • Seward 4,455

Adjacent counties[edit]


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

The county is named after Amos Kendall. 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.


Elected officials[edit]

(As of December 2012) County Board members run in two districts. All other officers run county-wide:

  • County Board Members: John P. Purcell, John Shaw, Judy Gilmour, Matthew Prochaska, Amy Cesich, Elizabeth Flowers, Lynn Cullick, Dan Koukol, Scott Gryder, Jeff Wehrli
  • John Shaw - County Board Chairman
  • Becky Morganegg - Clerk of the Circuit Court
  • Ken Toftoy - Coroner
  • Debbie Gillette - County Clerk and Recorder
  • Richard Randall - Sheriff
  • Eric Weis - State's Attorney
  • Jill Ferko - Treasurer

School districts[edit]

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.[5]


Historical population
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. 2012 118,105 2.9%
U.S. Decennial Census[6]
2012 Estimate[7]
2000 census age pyramid for Kendall County

As of the census[8] of 2000, there were 54,544 people, 18,798 households, and 14,963 families residing in the county. (However, since then there has been a dramatic increase in the population, with 103,460 residents in 2008.[9] The population density was 170 people per square mile (66/km²). There were 19,519 housing units at an average density of 61 per square mile (24/km²). The racial makeup of the county was 92.88% White, 1.32% Black or African American, 0.19% Native American, 0.88% Asian, 0.02% Pacific Islander, 3.38% from other races, and 1.34% from two or more races. 7.49% of the population were Hispanic or Latino of any race. 27.2% were of German, 12.5% Irish, 7.4% English, 5.9% Polish, 5.8% Norwegian, 5.1% American and 5.0% Italian ancestry according to Census 2000. 91.6% spoke English and 6.5% Spanish as their first language.

There were 18,798 households out of which 41.70% had children under the age of 18 living with them, 68.80% were married couples living together, 7.50% had a female householder with no husband present, and 20.40% were non-families. 16.40% of all households were made up of individuals and 6.10% had someone living alone who was 65 years of age or older. The average household size was 2.89 and the average family size was 3.27.

In the county the population was spread out with 29.50% under the age of 18, 7.50% from 18 to 24, 32.40% from 25 to 44, 22.10% from 45 to 64, and 8.50% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 98.70 males. For every 100 females age 18 and over, there were 95.90 males.

The median income for a household in the county was $64,625, and the median income for a family was $69,383 (these figures had risen to $74,539 and $81,517 respectively as of a 2007 estimate[10]). Males had a median income of $50,268 versus $30,415 for females. The per capita income for the county was $25,188. About 2.00% of families and 3.00% of the population were below the poverty line, including 3.50% of those under age 18 and 4.50% of those age 65 or over.

Kendall County was listed as the fastest growing county in the USA from 2000 to 2009, experiencing a population growth rate of 110.4% in this period.[11] The reason for this growth is heavy suburbanization stemming from the metro Chicago.


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.[12]

Cities and towns[edit]

Climate and weather[edit]

Yorkville, Illinois
Climate chart (explanation)
Average max. and min. temperatures in °F
Precipitation totals in inches
Source: The Weather Channel[13]

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.[13]

In Popular Culture[edit]

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 movie, "Man of Steel". Plano has also been used in the movie "Witless Protection", with both movies 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 also[edit]


  1. ^ "Kendall County QuickFacts". United States Census Bureau. Retrieved 2011-11-05. 
  2. ^ "Population Distribution and Change: 2000 to 2010" (PDF). United States Census Bureau. March 2011. p. 9. Retrieved 2011-03-26. 
  3. ^ "Find a County". National Association of Counties. Retrieved 2011-06-07. 
  4. ^ "Census 2010 U.S. Gazetteer Files: Counties". United States Census. Retrieved 2011-11-05. 
  5. ^ retrieved 2007-02-13
  6. ^ "U.S. Decennial Census". Retrieved July 27, 2013. 
  7. ^ "Annual Estimates of the Resident Population: April 1, 2010 to July 1, 2012". Retrieved July 27, 2013. 
  8. ^ "American FactFinder". United States Census Bureau. Retrieved 2008-01-31. 
  9. ^ Francesca Levy, "Best Places To Get Ahead 2010 - Yahoo! Real Estate". Retrieved 2010-07-22. 
  10. ^ "Kendall County, Illinois - Fact Sheet - American FactFinder". Retrieved 2010-07-22. 
  11. ^ "2010 US Census Brief". Retrieved 8 May 2012. 
  12. ^ Place Names & Geological Features of Kendall County
  13. ^ a b "Monthly Averages for Yorkville, Illinois". The Weather Channel. Retrieved 2011-01-27. 


  • 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 links[edit]

Coordinates: 41°35′N 88°26′W / 41.59°N 88.43°W / 41.59; -88.43