Riverbank is a city in Stanislaus County, California, United States. The population was 24,623 at the 2020 census, up from 15,826 at the 2000 census. Incorporated on August 23, 1922, Riverbank's official slogan is "City of Action." It is part of the Modesto Metropolitan Statistical Area. Riverbank was founded as a ferry crossing, and was established as a town with the coming of the San Francisco and San Joaquin Valley Railroad, which was soon acquired by the Santa Fe Railroad.