ADX Florence is a 37-acre (15 ha) complex located at 5880 Highway 67, in an unincorporated area, with a Florence, Colorado, postal address. It is located about 100 miles (160 km) south of Denver and 40 miles (64 km) south of Colorado Springs. It is part of the Federal Correctional Complex, Florence (FCC Florence) which consists of three correctional facilities, each with a different security rating.
The majority of the facility is above ground, with the exception of a subterranean corridor that links cellblocks to the lobby. Each cell contains a desk, stool, and bed, constructed almost entirely of poured concrete, as well as a toilet that shuts off if blocked, a shower that runs on a timer to prevent flooding, and a sink lacking a potentially dangerous tap. Rooms may also be fitted with polished steel mirrors bolted to the wall, an electric light that can be shut off only remotely, a radio, and a television that shows recreational, educational, and religious programming.
The 4-inch-by-4-foot (10 cm × 1.2 m) windows are designed to prevent inmates from knowing their specific location within the complex. They can see only the sky and roof through them, so it is virtually impossible to plan an escape. Inmates exercise in a concrete pit resembling an empty swimming pool, also designed to prevent them from knowing their location in the facility. The pit is large enough only for a prisoner to walk ten steps in a straight line or thirty-one steps in a circle. Correctional officers generally deliver food to the cells. Inmates transferred to USP ADX Florence from other prisons may be allowed to eat in a shared dining room.