Some maximum security prisons in the United States are Allenwood, Beaumont, Big Sandy, Canaan, Coleman I, Coleman II, Lee, Lewisburg, McCreary, Terre Haute, Tucson, Victorville, Yazoo City and Pollock. These correctional facilities are all high security penitentiaries, according to the Federal Bureau of Prisons. In addition to these institutions, the federal prison system includes the Florence ADX, located in Colorado, which is a super-maximum prison that houses the most dangerous inmates in the country.
United States penitentiaries exist across the United States, according to the Federal Bureau of Prisons. Several states have multiple penitentiaries, including Pennsylvania, California and Colorado. Pennsylvania contains the Allenwood, Canaan and Lewisburg facilities. Atwater, Lompoc and Victorville reside in California, and Colorado contains the Florence complex.
Regardless of location, all maximum security prisons have several commonalities. They have properties secured by wired fences or high walls and have 24-hour surveillance. United States penitentiaries have isolated cells and multi-cell rooms, which house inmates convicted of lesser crimes. These high security prisons also have a large staff to prisoner ratio, which ensures maximal control over the inmates.
Some maximum security prisons stand alone, but others are part of prison complexes. In addition to the Florence complex in Colorado, USP Marion in Illinois rests on a compound. This facility contains a satellite mid-security prison. USP Marion also has a special Communication Management Unit that implements stricter security and rules for especially dangerous inmates.