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The United States Penitentiary, Administrative Maximum Facility is an American federal prison in Fremont County near Florence, Colorado. It is operated by the Federal Bureau of Prisons, a division of the United States Department of Justice. USP ADX Florence, which opened in 1994, is classed as a supermax or "control unit" prison, thus providing a higher, more controlled level of custody than a maximum security prison. USP ADX Florence forms part of the Federal Correctional Complex, Florence, which is situated on 49 acres of land and houses different facilities with varying degrees of security, including the United States Penitentiary, Florence High.