The Patrol Division is dedicated to providing the best service possible to the citizens of San Joaquin County. The Patrol Division is organized to provide Emergency First Response, Investigation of reported crimes, provide specialized police services, and assist citizens in creating safe neighborhoods.

There are 124 uniformed deputies providing Law Enforcement Patrol Service 24 hours a day 7 days a week. The deputies are divided into 10 patrol teams on two day off sequences (5 teams on duty each day). The county is divided into eight geographical areas or beats. These 'beat areas' are staffed around the clock, providing emergency response capability to citizens in the unincorporated area.

Additionally, these same deputies act as deputy coroners, responding to unattended deaths in the San Joaquin County (city and county). They investigate the death, determining if foul play is suspected, and provide valuable investigation material to the pathologist who determines the medical cause of death.