Chicagoland

The Chicago metropolitan area is the metropolitan area associated with the city of Chicago in the United States. It is the area that is closely linked to the city through social, economic, and cultural ties. There are several definitions of the area, the two most common being the area under the jursidiction of the Chicago Metropolitan Agency for Planning (a metropolitan planning organization), and the area defined by the federal Office of Management and Budget (OMB) as the Chicago-Naperville-Joliet, IL-IN-WI Metropolitan Statistical Area (MSA).
See more at Wikipedia.org...