Simi Valley is a city located in the valley of the same name in southeastern Ventura County, California, United States. Situated approximately 37 miles northwest of Downtown Los Angeles, it is considered part of the Greater Los Angeles Area. The city borders Thousand Oaks, Moorpark, and the Chatsworth neighborhood of Los Angeles.
Geographically, Simi Valley is surrounded by the Santa Susana Mountains and the Simi Hills, positioned west of the San Fernando Valley and northeast of the Conejo Valley. As of the 2020 census, the city had a population of 126,356.
The area developed primarily as a bedroom community for residents working in the Los Angeles area and the San Fernando Valley. This growth was facilitated by the construction of a freeway over the Santa Susana Pass.