Chicago! An Intro.

Chicago is the largest city in the state of Illinois, the largest in the Midwest, and, with a population of nearly 3 million people, is the third-most populous city in the United States. The Chicago metropolitan area (commonly referred to as Chicagoland) has a population of over 9.5 million people in Illinois, Wisconsin and Indiana, making it also the third largest metropolitan area in the U.S.[1] Chicago is primarily located in Cook County, Illinois.