The San Diego County Sheriff's Department (SDSO), is the primary and largest law enforcement agency in San Diego County, California, and one of the largest sheriff’s departments in the United States: with over 4,000 employees, an annual budget of over $600 million, and a service area over 4,500 square miles extending to a 60 mile international border. The department, established in 1850, has over 4,000 sworn deputies and additional civilian support personnel servicing an area of nearly 4,526 mi².