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Chicago is the most populous city in the U.S. state of Illinois and in the Midwestern United States. Located on the western shore of Lake Michigan, it is the third-most populous city in the United States with a population of 2.74 million at the 2020 census, while the Chicago metropolitan area has 9.41 million residents and is the third-largest metropolitan area in the nation. Chicago is the seat of Cook County, the second-most populous county in the United States.
Country: United States
State: Illinois
Settled: c. 1780
Founded by: Jean Baptiste Point du Sable
Area codes: 312, 773, 872
Counties: Cook (small part of Chicago O'Hare Airport in DuPage)