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There are 102 counties in Illinois. The most populous of these is Cook County, the second-most populous county in the United States and the home of Chicago, while the least populous is Hardin County. The largest by land area is McLean County, while the smallest is Putnam County. Illinois's FIPS state code is 17 and its postal abbreviation is IL.
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.
As the seat of Cook County, the second-most populous county in the U.S., Chicago is the center of the Chicago metropolitan area, often colloquially called "Chicagoland" and home to 9.6 million residents.
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 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. With a population of approximately 5.2 million people, it is the second most populous county in the nation and the 19th largest government in the United States (2015 census ...
The flag of Cook County, Illinois, nicknamed "I Will", consists of a light blue pall with a green border on a field of white. Six red stars with seven points each sit in a circle at the flag's hoist side, drawing cues from the city flag and other symbols of the county seat of Chicago and its in-county suburbs.
Cities in Illinois by county. Populated places in Cook County, Illinois.
