Chicago is the most populous city in the U.S. state of Illinois and in the Midwestern United States. With a population of 2,746,388, as of the 2020 census, it is the third-most populous city in the United States after New York City and Los Angeles. 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.
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)
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