The cities that Ventura County Sheriff's Office provides police services for are Camarillo, Fillmore, Moorpark, Ojai, and Thousand Oaks.

What began as a duty to collect taxes and catch horse thieves has evolved significantly as the county has changed and grown.

Deputy Donald Gregory was killed instantly on September 9, 1951, when the patrol car his partner was driving hit a telephone pole.

Reserve (Auxiliary) Deputy Bryce Patten was shot and killed on August 19, 1960, while working a roadblock on Casitas Pass Road.

Bryce graduated summa cum laude from the University of California, Santa Barbara, and was a full-time history teacher at Ventura High School.

He donated many hours to improve his patrol skills, and served the children in the community as a Boy Scout Troop Leader.

Deputy Chester "Chico" Larson drowned on January 20, 1969, while attempting to rescue a group of hikers at Sespe Creek.

Detective Donald E. Haynie was shot and killed June 5, 1970, while attempting to make a narcotics arrest in Fillmore.

Deputy Peter Aguirre was shot and killed on July 17, 1996, while responding to a domestic call in the City of Ojai.

Her strong work ethic gained her the position of investigator with the Major Crimes Unit after serving only eight years as an officer.

Deputy Robert D. Bornet, a 10-year veteran of the Ventura County Sheriff's Office, was killed on November 6, 2006, in a traffic accident while attempting to stop a motorist for a vehicle code violation.

Bornet also served 19 years in the United States Navy earning the rate of master chief petty officer.

Deputy Eugene Kostiuchenko, an 11-year veteran, was killed on October 28, 2014, while concluding a traffic stop on the 101 freeway at the Lewis Road off-ramp, in the Californian city of Camarillo.

[3][4] Search and Rescue Team Member Jeffrey "Jef" Dye died on February 2, 2019, when he was struck by a vehicle on the center median of the I-5 Freeway near Gorman.

Jef Dye is the first Ventura County Search and Rescue Team Member to have been killed in the line of duty.

The Ventura County Sheriff's Office's rank structure is as follows: Senior Deputy insignia is 2 chevrons the same color as Sergeants [8]