Chicago is the most populous city in the U.S. state of Illinois, and the third most populous city in the United States, following New York City and Los Angeles. With an estimated population of 2,693,976 in 2019, it is also the most populous city in the Midwestern United States and the fifth most populous city in North America. Chicago is the county seat of Cook County, the second most populous county in the U.S., while a small portion of the city’s O’Hare Airport also extends into DuPage County. Chicago is the principal city of the Chicago metropolitan area, defined as either the U.S. Census Bureau’s metropolitan statistical area (9.4 million people) or the combined statistical area (almost 10 million residents), often called Chicagoland. It constitutes the third most populous urban area in the United States after New York City and Los Angeles and is one of the 40 largest urban areas in the world. Wikipedia.org
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