Chicago is the largest city in the state of Illinois. With over 2.8 million residents, it is the most populous city in the Midwestern United States and the third most populous city in the country. Its metropolitan area, commonly named "Chicagoland," is the 26th most populous in the world, home to an estimated 9.7 million people spread across the U.S. states of Illinois, Wisconsin, and Indiana. Chicago is the county seat of Cook County.
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