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.
AdChicago Architecture Tour of 2025. Free Cancellation & Full Refund Available. Full Refund if You Cancel at least 24 Hours in Advance. Book Now. Do More with Viator.
All Available in One App · Free Cancellation · Over 300,000 Experiences
The most venerable and polished of the tour-and-activity sites. – BBC