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Chicago is the largest city in the US state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the USA, after New York City and Los Angeles. Its metropolitan area, commonly named "Chicagoland," is the 27th most populous urban agglomeration in the world and the third largest in the United States, home to an estimated 9.5 million people spread across the US states of Illinois, Wisconsin, and Indiana. Chicago is the county seat of Cook County, the second most populous county in the United States, after Los Angeles County, California.
