Forest Park (formerly Harlem) is a village in Cook County, Illinois, a suburb of Chicago, United States. The population was 14,167 at the 2010 census. The Forest Park terminal on the CTA Blue Line is the line's western terminus, located on the Eisenhower Expressway at Des Plaines Avenue.
Forest Park is located at 41°52′23″N 87°48′40″W (41.873031, -87.811155). According to the 2010 census, Forest Park has a total area of 2.4 square miles (6.22 km2), all land. The Des Plaines River runs through Forest Park.
The community (formerly part of a larger town called Harlem) officially became incorporated under the name of Forest Park on April 17, 1907.
For much of its history, Forest Park was known as a "Village of cemeteries", with more dead "residents" than living ones; some figures estimate the ratio at 30:1, dead to alive. Forest Park cemeteries include Altenheim, Forest Home Cemetery (incorporating the German Waldheim Cemetery), Jewish Waldheim (producer Mike Todd is buried in Beth Aaron there), Woodlawn (including Showmen's Rest), and Concordia. Forest Home Cemetery is home to the famous Haymarket Martyrs' Monument.
From 1925 to 1931, Forest Park had a radio station with a variety of call letters. The station began in 1925 as WHT. It was known as WNBA, with its studios near Des Plaines and Roosevelt Road from 1927 to 1928.