The Cook County Jail, located on 96 acres in Cook County, Illinois, is the largest single site jail in the United States of America. It is located at 2700 South California Avenue in the city of Chicago, it houses about 10,000prisoners and employs 3,900 law enforcement officials and 7,000 civilian employees. The jail has held several well-known and infamous criminals, including Tony Accardo, Frank Nitti, Larry Hoover, Jeff Fort, Richard Speck, John Wayne Gacy and the Chicago Seven.