Riverdale Park is a census-designated place (CDP) in Stanislaus County, California, United States.

[3] According to the United States Census Bureau, the CDP has a total area of 1.5 square miles (3.9 km2), 96.93% of it land and 3.07% of it water.

The 2010 United States Census[4] reported that Riverdale Park had a population of 1,128.

36 households (12.1%) were made up of individuals, and 15 (5.0%) had someone living alone who was 65 years of age or older.

There were 321 housing units at an average density of 216.6 per square mile (83.6/km2), of which 173 (58.1%) were owner-occupied, and 125 (41.9%) were occupied by renters.

There were 316 housing units at an average density of 222.6 per square mile (85.9/km2).

11.4% of all households were made up of individuals, and 5.2% had someone living alone who was 65 years of age or older.

In the California State Legislature, Riverdale Park is in the 12th Senate District, represented by Republican Shannon Grove, and the 21st Assembly District, represented by Democrat Diane Papan.