Simi Valley is an incorporated city located in a valley of the same name in the southeast corner of Ventura County, California, bordering the San Fernando Valley of Los Angeles in the Greater Los Angeles Area.
The city of Simi Valley is surrounded by the Santa Susana Mountain range and the Simi Hills, west of the San Fernando Valley and east of the Conejo Valley. It is largely a commuter bedroom community feeding the larger cities in Ventura County to the west and the Los Angeles area.