Oak Park is a census-designated place located in the Simi Hills, in Ventura County, California. As of the 2010 census, Oak Park had a population of 14,266, down from 14,625 at the 2000 census. It is located in the Conejo Valley, north from Malibu and Agoura Hills and is a part of Ventura County.
The location of Oak Park was originally part of Rancho Simi, a Spanish land concession in Alta California given in 1795 to Francisco Javier Pico, a soldier of the Santa Barbara company, and his two brothers, Patricio Pico and Miguel Pico by the Spanish government. Lindero Canyon Road follows the western border lindero in Spanish of the land grant.
Throughout the 20th century, studios used the area to film movies and in particular westerns. Movies filmed locally include The Red Pony and A Walk in the Sun.