Riverside is a suburban village in Cook County, Illinois, United States. The population of the village was 9,298 at the 2020 census. It is a suburb of Chicago, located roughly 9 miles west of downtown Chicago and 2 miles outside city limits. A significant portion of the village is in the Riverside Landscape Architecture District, designated a National Historic Land…Riverside is a suburban village in Cook County, Illinois, United States. The population of the village was 9,298 at the 2020 census. It is a suburb of Chicago, located roughly 9 miles west of downtown Chicago and 2 miles outside city limits. A significant portion of the village is in the Riverside Landscape Architecture District, designated a National Historic Landmark in 1970.