Chicago

Chicago is a city in the U.S. state of Illinois, is the third most populous city in the United States and the most populous city in the American Midwest; with approximately 2.7 million residents. Its metropolitan area (also called "Chicagoland"), which extends into Indiana and Wisconsin, is the third-largest in the United States, after those of New York City and Los Angeles, with an estimated 9.5 million people. Chicago is the county seat of Cook County, though a small portion of the city limits also extends into DuPage County.