Camarillo is a city in Ventura County, California, USA. The population was 65,201 at the 2010 census, up from 57,084 at the 2000 census. The Ventura Freeway is the city’s primary thoroughfare. Camarillo is named for Adolfo and Juan Camarillo, two of the few Californios (pre-1848 California natives of Hispanic ancestry) to preserve the city’s heritage after the arrival of Anglo settlers. As with most cities in Ventura County, it is noted for its resistance to new development.