Agoura Hills is an affluent city in Los Angeles County, California. Its population was 20,330 at the 2010 census, down from 20,537 at the 2000 census. It is in the eastern Conejo Valley between the Simi Hills and the Santa Monica Mountains. This city on the Ventura Freeway (U.S. Route 101) straddles the border between the county of Los Angeles to the east, west and south and Ventura County to the north. It is about northwest of Downtown Los Angeles and less than west of the Los Angeles City limits (Woodland Hills). Agoura Hills and unincorporated Agoura sit next to Calabasas, Oak Park, and Westlake Village.