Hidden Hills is a city and gated community in Los Angeles County, California, United States. It is located in the Santa Monica Mountains adjacent to Calabasas and the San Fernando Valley region of Los Angeles. The population was 1,725 as of 2020.
The community was designed and developed in the 1950s by A. E. Hanson, a Southern California landscape architect and planned community developer. His earlier projects included Rolling Hills and Palos Verdes Estates, and the 1920s Beverly Hills Harold Lloyd Estate "Greenacres".
Hidden Hills became the 73rd city in Los Angeles County on October 19, 1961.
Vanity Fair described the city in 2017:
Originally conceived of as a "rustic retreat" from LA, it is now described as the "glitzy epicenter of Nouveau Hollywood"
Geography
It is a gated residential community with a total area of , all land.
Hidden Hills is in the southern Simi Hills Transverse range near the Santa Monica Mountains on the western edge of the San Fernando Valley, near the border with neighboring Ventura County.
Hidden Hills is bordered on the north by the nature reserve and greenbelt of the Upper Las Virgenes Canyon Open Space Preserve, a park with miles of equestrian, hiking, and mountain biking trails. Nearby to the south, is the pioneer Leonis Adobe National Historic Landmark, with gardens and a historical museum. The city lies just north of U.S. Route 101, also called the Ventura Freeway.