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Chicagoland is a name for the Chicago metropolitan area, which is made up of nine counties in three states. The name comes from a term promoted by the Chicago Tribune in the early 20th century.
The Chicago?Joliet?Naperville?Gary, Indiana?Kenosha, Wisconsin Consolidated Metropolitan Statistical Area (CMSA) had 9,157,540 inhabitants in the 2000 census. Population estimates for 2004 place the Chicagoland population at approximately 9,650,000 and is one of the 25 most populous metropolitan areas in the world.