What is Chicago metropolitan area?
{{Use mdy dates|date=May 2015}} {{Infobox settlement | name = Chicago Metropolitan Area / Chicagoland | other_name = Chicago–Naperville–Elgin, IL–IN–WI MSA | settlement_type = [[Metropolitan area|Metropolitan region]] <br />[[combined statistical area]] | image_skyline = {{multiple image | perrow = 1/2/2 | border = infobox | total_width = 280 | image1 = Chicago sunrise 1.jpg | image2 = Evanston, IL Aerial View.jpg | image3 = Chicago at Night (28824229986).jpg | image4 = Downtown Naperville Aerial.jpg | image5 = Downer Place, Aurora, IL.jpg }} | imagesize = | image_alt = | image_caption = From top, left to right: [[Chicago skyline]] from Lakefront Trail at [[Northerly Island]] during sunrise, aerial view [[Evanston, Illinois|Evanston]], view of [[Gold Coast (Chicago)|Gold Coast]], Downtown [[Naperville, Illinois|Naperville]], view of Downtown [[Aurora, Illinois|Aurora]] | nickname = | image_map = | map_alt = | map_caption = | pushpin_map = | pushpin_label_position = | pushpin_map_alt = | pushpin_map_caption = | coordinates = {{Coord|41|54|N|87|39|W|source:hewiki_region:US_type:city|display=title,inline}} | coor_pinpoint = | coordinates_footnotes = | subdivision_type = Country | subdivision_name = {{USA}} | subdivision_type1 = State(s) | subdivision_name1 = {{plainlist| * {{Flag|Illinois}} * {{Flag|Indiana}} * {{Flag|Wisconsin}} }} | subdivision_type2 = | subdivision_name2 = | seat_type = [[Core city]] | seat = {{flag|Chicago}} | parts_type = [[Satellite city|Satellite cities]] | parts = {{plainlist| * &nbsp;- [[Aurora, Illinois|Aurora]] * &nbsp;- [[Joliet, Illinois|Joliet]] * &nbsp;- [[Naperville, Illinois|Naperville]] * &nbsp;- [[Elgin, Illinois|Elgin]] * &nbsp;- [[Waukegan, Illinois|Waukegan]