Chicago is the most populous city in Illinois and the third most populous city in the United States. With an estimated population of 2,693,976 in 2019, it is also the largest city in the Midwest.
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Chicago is the county seat of Cook County, the second most populous county in the United States, with a small part of the city in Doo Page County. Chicago is the main city of the Chicago metropolitan area, sometimes referred to as "Chicago". With a population of nearly 10 million, this metropolitan area is the third most populous in the United States.