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Chicago (, ), officially the City of Chicago, is the third most populous city in the United States. As of the 2017 census-estimate, it has a population of 2,716,450, which makes it the most populous city in both the state of Illinois and the Midwestern United States. Chicago is the county seat of Cook County, the second most populous county in the United States, and the principal city of the Chicago metropolitan area, which is often referred to as "Chicagoland." The Chicago metropolitan area, at nearly 10 million people, is the third-largest in the United States, the fourth largest in North America, and the third largest metropolitan area in the world by land area.
2,716,450