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 13,811, down from 14,225 at the 2000 census. It is located in the Conejo Valley, north from Malibu and Agoura Hills and is a part of Ventura County.
Oak Park has had human occupation from about 5500 B.C. to the present day. It lies within a zone including the early Millingstone Horizon and inland Chumash Indians. Indians camped throughout the area as they collected acorns, yucca, and other food. The sites in the area include major villages, smaller camps and several rock shelters.
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.
Oak Park was formed from ranchland owned by Cosmo Stevens and Marian Jordan, stars of the radio show Fibber McGee and Molly. The land was purchased by Metropolitan Development Corporation in the 1960s. Homes were developed starting in the late 1960s.