Camarillo (/ˌkæməˈriːoʊ/ KAM-ə-REE-oh) 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 (U.S. Route 101) 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. The railroad coast route came through in 1898 and built a station here. Adolfo Camarillo eventually employed 700 workers growing mainly lima beans. Walnuts and citrus were also grown on the ranch. Adolfo bred Camarillo White Horses in the 1920s through the 1960s and was well known for riding them, dressed in colorful Spanish attire, in parades such as the Fiesta of Santa Barbara.
The city grew slowly prior to World War II but the war effort saw the construction of the Oxnard Air Force Base (now Camarillo Airport) to the west of town. The community grew as the new base along with a Naval Air Station Point Mugu and a Seabee base at Port Hueneme brought many workers and their families to the area. The grounds of Camarillo State Hospital, that opened in 1936 south of town, is now the campus of California State University, Channel Islands.
As with most cities in Ventura County, it is noted for its resistance to new development. In 2014, the council voted against a 895 acre project that would have extended development on agricultural lands east towards the Conejo Grade.