Kankakee County is a county located in the U.S. state of Illinois. According to the 2020 census, it has a population of 107,502.^[1] Its county seat is Kankakee.^[2] Kankakee County comprises the Kankakee, IL Metropolitan Statistical Area.

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Kankakee County
County
Kankakee County Courthouse
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Coordinates: 41°08′N 87°52′W
Country	United States
State	Illinois
Founded	February 11, 1853
Named for	Kankakee River
Seat	Kankakee
Largest city	Kankakee
Area
• Total	681 sq mi (1,760 km2)
• Land	677 sq mi (1,750 km2)
• Water	4.8 sq mi (12 km2)  0.7%
Population  (2020)
• Total	107,502
• Density	160/sq mi (61/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional districts	1st, 2nd
Website	www.co.kankakee.il.us

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Starting in the 1770s, if not earlier, the area that is now Kankakee County was largely populated by the Pottawatami.

French Canadian Settlers came to Kankakee County in 1834, after the federal government signed the Treaty of Camp Tippecanoe in 1832. They were soon joined by migrants from New York and Vermont, mostly locating in Momence, Illinois. In the 1840s, most of the migrants were French Canadians, and they settled in such places as Bourbonnais.

An act of the Illinois Legislature created Kankakee County out of the north part of Iroquois County and the south part of Will County in February 1853. The six original townships were Yellowhead, Rockville, Bourbonnais, Momence, Aroma Park, and Limestone. The population of the new county was about 8,000. In 1855 the two western townships (Norton and Essex) were taken from Vermilion County and added to Kankakee County. The county was named for the Kankakee River.

• Kankakee County at the time of its creation in 1853

According to the U.S. Census Bureau, the county has a total area of 681 square miles (1,760 km²), of which 677 square miles (1,750 km²) (99.3%) is land and 4.8 square miles (12 km²) (0.7%) is water.^[3]

As of the 2010 United States Census, there were 113,449 people, 41,511 households, and 28,680 families residing in the county.^[11] The population density was 167.7 inhabitants per square mile (64.7/km²). There were 45,246 housing units at an average density of 66.9 per square mile (25.8/km²).^[3] The racial makeup of the county was 77.6% white, 15.1% black or African American, 0.9% Asian, 0.3% Native American, 4.0% from other races, and 2.1% from two or more races. Those of Hispanic or Latino origin made up 9.0% of the population.^[11] In terms of ancestry, 26.5% were German, 14.2% were Irish, 7.4% were English, 6.7% were Italian, 5.8% were Polish, and 3.6% were American.^[12]

Of the 41,511 households, 35.2% had children under the age of 18 living with them, 49.1% were married couples living together, 14.7% had a female householder with no husband present, 30.9% were non-families, and 25.5% of all households were made up of individuals. The average household size was 2.61 and the average family size was 3.13. The median age was 36.7 years.^[11]

The median income for a household in the county was $50,484 and the median income for a family was $59,998. Males had a median income of $49,858 versus $32,247 for females. The per capita income for the county was $22,888. About 10.8% of families and 15.0% of the population were below the poverty line, including 20.6% of those under age 18 and 8.4% of those age 65 or over.^[13]

Kankakee County is currently considered a Republican-leaning swing county. In the 2008 Presidential Election, Kankakee County voted 52 percent in favor of Illinois native Barack Obama (D), giving 47 percent to John McCain (R). However, in the 2004 Presidential Election, Kankakee County voted 55 percent in favor of George W. Bush (R) and 44 percent for John Kerry (D).

Kankakee County is split between Illinois's 2nd congressional district, represented by Democrat Robin Kelly (D-Matteson), and Illinois's 1st congressional district, represented by Jonathan Jackson (D-Chicago). Kankakee County has produced three governors: Len Small (R), Samuel H. Shapiro (D), and George H. Ryan (R).

In December 2016, Kankakee County became the only county in Illinois to have a Libertarian county board member when Jim Byrne of Bradley left the Republican Party to join the Libertarian Party.^[15] In the 2020 general election, Byrne lost reelection to Democratic candidate Heather Bryan, while Libertarian Jacob Collins was elected unopposed on the Libertarian line continuing Kankakee County's distinction of being the only county with a Libertarian board member^[16][17] until Collins opted not to run for reelection in the 2022 general election.^[18]

The county is home to Olivet Nazarene University and Kankakee Community College.

Kankakee County is served by the Greater Kankakee Airport. Amtrak runs train service through the city via Kankakee station. The station serves the Illini and Saluki trains to Carbondale as well as the City of New Orleans. The city of Kankakee has local public transit service provided by the River Valley Metro Mass Transit District. Momence and rural Kankakee county are served by SHOW Bus.

• National Register of Historic Places listings in Kankakee County, Illinois