Casitas Springs is an unincorporated community in Ventura County, California, located 1.2 miles (1.9 km) east of Lake Casitas. It is an old community which was recorded as Arroyo de Las Casitas in 1864. It has a population of 1,038 as of 1999, down from 1,090 in 1990 Census. Casitas Springs is located along California State Route 33 2 miles (3.2 km) south of Oak View.