Los Angeles County District Attorney's Office | 3,895 followers on LinkedIn. The Los Angeles County District Attorney’s Office is the largest local prosecutorial office in the United States. | The Los Angeles County District Attorney’s Office is the largest local prosecutorial office in the United States. Members of the District Attorney’s staff strive to vigorously, effectively and fairly prosecute all those who break laws in Los Angeles County and see that those convicted are appropriately punished. Nearly 1,000 attorneys, known as deputy district attorneys, prosecute serious crimes called felonies throughout Los Angeles County.