The
United States Penitentiary, Administrative Maximum Facility (
ADX) is an American federal
supermax prison for male inmates located in
Fremont County, Colorado. It is unofficially known as
ADX Florence, Florence ADMAX, Supermax, or
the Alcatraz of the Rockies. Part of the
Florence Federal Correctional Complex, which is operated by the
Federal Bureau of Prisons (BOP), a division of the
United States Department of Justice, houses the male inmates in the federal prison system who are deemed the most dangerous and in need of the tightest control. ADX also includes an adjacent minimum-security camp that, , houses more prisoners than the supermax unit.