United States Penitentiary Marion
 The United States Penitentiary Marion (USP Marion) is a medium-security United States federal prison for male inmates in Illinois. It is operated by the Federal Bureau of Prisons a division of the United States Department of Justice. The facility also has an adjacent satellite prison camp that houses minimum security male offenders.USP Marion is located approximately 9 miles (14 km) south of the city of Marion Illinois 300 miles (480 km) from Chicago and 120 miles (190 km) from St.