Simi Valley is a city in the valley of the same name in southeastern Ventura County, California, United States. It is 37 miles (60 km) northwest of Downtown Los Angeles, making it part of the Greater Los Angeles Area. Simi Valley borders Thousand Oaks, Moorpark, and the Chatsworth neighborhood of Los Angeles. As of the 2020 census, Simi Valley had a population of 126,356. The city of Simi Valley i…