San Diego County is located in the southwestern corner of California and is the second-most populous county in the state. It is bordered by Imperial County to the east, Riverside County to the northeast, Orange County to the north, and the Pacific Ocean to the west. The county seat is San Diego, the eighth-largest city in the United States.

The county government is composed of the Board of Supervisors, which is the governing body of the county, and various departments and agencies. The Board of Supervisors is responsible for setting policy, approving the budget, and appointing department heads. The county is divided into five supervisorial districts, each of which is represented by one supervisor.

The county is home to numerous military bases, including Marine Corps Air Station Miramar, Naval Base San Diego, and Naval Base Coronado.

The county is served by the San Diego County Sheriff's Department, which is responsible for law enforcement and public safety. The county also has its own fire department, which is responsible for fire protection and emergency medical services. The county is served by the San Diego County Health and Human Services Agency, which provides health and social services to residents. The county is also served by the San Diego County Office of Education, which is responsible for providing educational services to students in the county.

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