article: Chicago metropolitan area
links: North American Numbering Plan Area code 312 Evanston, Illinois Satellite city Michigan City, Indiana Gold Coast (Chicago) Chicago Naperville, Illinois Illinois Indiana Kankakee, Illinois Waukegan, Illinois United States Area code 574 Area code 773 Area code 262 Hammond, Indiana Area code 847 Area code 219 Area code 630 Aurora, Illinois United States Census Bureau Joliet, Illinois Elgin, Illinois Gary, Indiana Northerly Island Combined statistical area United States metropolitan area Central Time Zone Kenosha, Wisconsin Metropolitan statistical area Metropolitan area