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Cook County is a county in the American state of Illinois. Chicago is the county seat of Cook County. Los Angeles County, California is the only county with a higher population than Cook County. About 5,276,000 people live in Cook County. This is 41 percent of all the people who live in Illinois.
Thornton Township is one of 29 townships in Cook County, Illinois. As of the 2020 census, its population was 157,865. Incorporated in 1850, it is located immediately south of the city of Chicago. It is the second most populous township in Illinois as of the 2020 census, after Rockford Township (pop. 170,478) in Winnebago County.
Cook County is the most populous county in the U.S. state of Illinois and the second-most-populous county in the United States, after Los Angeles County, California. More than 40 percent of all residents of Illinois live within Cook County. As of 2020, the population was 5,275,541.
Cook County contains 134 municipalities in its region, the most well known being the City of Chicago – which is the County seat where the central offices of Cook County are located.
Cook served as the first Illinois attorney general and the second U.S. congressman from Illinois. Cook County Poor House, 1908. The first Cook County Board met in 1831 with three members: two from Chicago and one from Naperville (DuPage did not become a separate county until 1839).
Cook County is an urban county in the upper northeastern section of the State of Illinois that contains more than 800 local governmental units within its boundaries.
Cities in Illinois by county. Populated places in Cook County, Illinois.
