Principal Municipalities
Illinois - Aurora, Elgin, Joliet, Naperville, Bolingbrook, Arlington Heights, Evanston, Skokie, Waukegan, Schaumburg, Palatine
Indiana - Gary, Hammond
Wisconsin - Kenosha
Counties
Illinois - Cook (Outside I-294), DuPage, Will, Grundy, DeKalb, Kane, Kendall, McHenry, Lake
Indiana - Lake, Porter
Wisconsin - Kenosha
