FCC Florence, the Federal Correctional Complex in Fremont County, Colorado, is one of the more unusual clusters in the federal system because it brings together nearly every security tier the Bureau of Prisons uses on one campus. Built out through the early-to-mid 1990s and generally dated to 1994, the complex sits about 100 miles south of Denver in a stretch of Colorado sometimes called the state's "correctional capitol" because of how many prisons, state and federal, are concentrated in the area. Under the FCC umbrella are four separate institutions: a minimum-security camp, the medium-security FCI, the high-security USP Florence High, and the supermax ADX Florence, each run as its own facility with its own housing, staff, and rules even though they share perimeter security and support infrastructure. Combined, the complex holds somewhere around 2,300 to 2,900 inmates across all four units. Because "Florence" can refer to any of these four distinct prisons, families often need to double check exactly which unit a loved one is housed in, since visiting procedures, mail rules, and security levels differ significantly between the camp, the FCI, the USP, and the ADX supermax.