United States · Colorado · Florence
ADX Florence
Data is aggregated from public sources and may be incomplete or out of date. Always verify with primary sources before acting on any figure. See data sources.
For families
How to send mail, money, and visit ADX Florence
Step-by-step guidance using the United States system — addresses, money services, visit booking, what to bring on your first visit.
The federal supermax — the highest-security prison in the US federal system. Holds inmates judged 'extreme risks' including terror convicts and prior escapees.
Capacity
490
Current population
360
Occupancy
73%
Year opened
1994
Operational
Facility profile
Operator
Federal Bureau of Prisons
Population held
male
Opened
1994
Region
Colorado
Security level
Supermax
Death-row facility
No
Conditions
Single-cell confinement averaging 22-23 hours per day. Cells include a concrete bed, sink-toilet, and a 4-inch window. Recreation in an individual outdoor cage.
Visiting
Visits by appointment only; non-contact through plexiglass for most inmates. Approved visitor list required, processed by the warden's office.
Mailing
Mail screened by staff. No polaroids, hardcover books, or staples. Address: Inmate Name & Register #, ADX Florence, PO Box 8500, Florence, CO 81226.
Practical info
Inmate phone time is restricted and pre-scheduled. Money for commissary via MoneyGram or Western Union to the BOP Trust Fund.
Known issues
Long-running litigation over solitary confinement of mentally ill prisoners (Cunningham v. BOP, settled 2016).
Notable inmates
Ramzi Yousef, Ted Kaczynski (transferred 2021), Robert Hanssen, Terry Nichols, Zacarias Moussaoui.
Contact & address
Conditions Risk Score
Derived signal — not a judgement. How it's calculated
- Overcrowding
- 0/30
- Oversight reports
- 0/30
- Structural flags
- 5/15
- Death signals
- 0/15
- Conditions text
- 0/10
What the score is responding to:
- · Substantial documented known-issues record
Trend over time
Population and occupancy by year. Source: official corrections statistics + oversight reports.
Population held
Occupancy %
Compared to other facilities in United States
3134 peersHigher risk than 79% of peer facilities in United States.
Reports
- Cunningham v. BOP — federal settlement15 Nov 2016
BOP agreed to fundamental reforms in the identification and treatment of mentally ill prisoners at ADX, including the creation of two new mental-health step-down units.
Data completeness
100%How many of our profile fields are populated. We surface this so families and researchers know the limits.
Sources
- Federal Bureau of Prisons — ADX Florence
- Cunningham v. BOP settlement
- Federal Bureau of Prisons — Locations — US Department of Justice
- See /data-sources for our overall methodology.