Welcome to the U.S. Attorney`s Office for the Southern District of California. The Southern District of California includes San Diego and Imperial counties. It is headquartered in San Diego, San Diego County. San Diego County is the second most populous county in California. The district branch is located in the town of El Centro in the Imperial County. Imperial County is located in the Imperial Valley and borders both the state of Arizona and the Republic of Mexico. Here you will find information about our office, press releases on important cases, and contact information for various law enforcement agencies. You will also find information for victims of crime and witnesses.