Riverside is a suburban village in Cook County, Illinois, United States. A significant portion of the village is in the Riverside Landscape Architecture District, designated a National Historic Landmark in 1970. The population of the village was 8,875 at the 2010 census. It is a suburb of Chicago, located roughly 9 miles (14 km) west of downtown Chicago and 2 miles (3 km) outside city limits.
Riverside is arguably the first planned community in the United States, designed in 1869 by Calvert Vaux and Frederick Law Olmsted. The village was incorporated in 1875. The Riverside Landscape Architecture District, an area bounded by 26th Street, Harlem and Ogden avenues, the Des Plaines River, and Golf Road, was designated a National Historic Landmark in 1970. In 1863 the Chicago, Burlington and Quincy Railroad was built heading southwest from downtown Chicago to Quincy, Illinois, passing through what is now the Near West Suburban area of Chicago in a western-southwestern direction. This new access to transportation and commerce brought about a significant housing and construction boom in what was once farmland far from the bustle of the city of Chicago.
In 1868, an eastern businessman named Emery E. Childs formed the Riverside Improvement Company, and purchased a 1,600-acre (6.5 km2) tract of property along the Des Plaines River and the Chicago, Burlington and Quincy Railroad line.