Hidden Valley (formerly, Union House) is a housing development in an unincorporated area of Placer County, California, adjacent to

Granite Bay Granite Bay is a census-designated place (CDP) in Placer County, California, United States. It is part of the Sacramento–Arden-Arcade– Roseville Metropolitan Statistical Area. The population was 21,247 at the 2020 census, up from 20,402 ...

. Hidden Valley is located east-southeast of Rocklin. It lies at an elevation of 436 feet (133 m). Hidden Valley was established in 1950 and consists of semi-rural housing lots surrounding 180 acres of pasture and small lakes. It was originally planned as a retirement community, due to its rural setting, but it has since become a bedroom community for the Sacramento metropolitan area. It was once informally called the "

Aerojet Aerojet was an American rocket and missile propulsion manufacturer based primarily in Rancho Cordova, California, with divisions in Redmond, Washington, Orange and Gainesville in Virginia, and Camden, Arkansas. Aerojet was owned by GenCorp. ...

enclave" for the large number of executives of the aerospace company who resided in the area.

References

Unincorporated communities in California Unincorporated communities in Placer County, California {{PlacerCountyCA-geo-stub