Oak Park is a village adjacent to the West Side of Chicago, Illinois. It is the 29th most populous municipality in Illinois as counted in the 2010 U.S. census. As of the 2010 United States Census the village had a population of 51,878.
Oak Park was settled beginning in the 1830s, with rapid growth later in the 19th century and early 20th century. It incorporated in 1902, breaking off from Cicero. Development was spurred by railroads and street cars connecting the village to jobs in Chicago. Architect Frank Lloyd Wright and his wife settled here in 1889. Population peaked at 66,015 in 1940. Smaller families led to falling population in the same number of homes and apartments. In the 1960s, Oak Park faced the challenge of racial integration, devising many strategies to integrate rather than resegregate the village. Oak Park includes three historic districts for the historic homes: Ridgeland, Frank Lloyd Wright and Seward Gunderson, reflecting the focus on historic preservation.