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)
SponsoredThe Best Chicago Tours and Things to Do in 2025 - Free Cancellation. Explore indoor attractions for a unique Chicago experience rain or shine.
SponsoredFind & Book Excursions Chicago. Tours, Activities, Excursions in Chicago. Find & Book the Best Things to Do in Chicago. Tours, Activities, Excursions in Chicago
Photos, Videos, & Maps · All Available in One App · A TripAdvisor Company