Riverside is an affluent suburban village in Cook County, Illinois. A significant portion of the village is in the Riverside Landscape Architecture District, designated a National Historic Landmark in 1970. The population was 8,895 at the 2000 census. It is a suburb of Chicago, located roughly 9 miles west of downtown Chicago and two miles outside city limits.
Riverside is arguably the first planned community in the United States, designed in 1869 by Frederick Law Olmsted. The village was incorporated in 1875. The Riverside Landscape Architecture District, an area bounded by 26th St., Harlem and Ogden Aves., the Des Plaines River, and Forbes Rd., was designated a National Historic Landmark in 1970.