Riverdale Park is a census-designated place (CDP) in Stanislaus County, California, United States. The population was 1,128 at the 2010 census, up from 1,094 at the 2000 census. It is part of the Modesto Metropolitan Statistical Area.GeographyRiverdale Park is located at .According to the United States Census Bureau, the CDP has a total area of 1.5sqmi, 96.93% of it land and 3.07% of it water.Demographics2010The 2010 United States Census reported that Riverdale Park had a population of 1,128. The population density was 761.1 people per square mile (293.8/kmĀ²). The racial makeup of Riverdale Park was 575 (51.0%) White, 6 (0.5%) African American, 25 (2.2%) Native American, 29 (2.6%) Asian, 0 (0.0%) Pacific Islander, 414 (36.7%) from other races, and 79 (7.0%) from two or more races. Hispanic or Latino of any race were 700 persons (62.1%).