United States · Illinois · Marion
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Usp Marion is a federal prison located in Williamson County, Illinois. Rated capacity: 1,129. Reported population: 1,129. Security level: Medium. Data sourced from the HIFLD Prison Boundaries open dataset.
The Federal Correctional Institution, Marion (FCI Marion) is a large medium-security United States federal prison for male inmates in Southern Precinct, unincorporated Williamson County, Illinois. It is operated by the Federal Bureau of Prisons, a division of the United States Department of Justice. The facility also has an adjacent satellite prison camp that houses minimum security male offenders. FCI Marion in Southern Illinois is approximately 9 miles (14 km) south of the city of Marion, Illinois, 300 miles (480 km) south of Chicago, and 120 miles (190 km) southeast of St. Louis, Missouri.
Source: Wikipedia article lead, CC-BY-SA.
Capacity
1,129
Current population
1,129
Occupancy
100%
Year opened
1963
Operational
Figures from official sources · verified 2 Jun 2026 · methodology
Operator
Federal Bureau of PrisonsPopulation held
male
Opened
1963
Region
Illinois
Security level
Medium
Death-row facility
No
BOP-operated facility; conditions reports issued by the DOJ Office of Inspector General on a multi-year cycle.
Visiting governed by BOP Program Statement 5267.09 — approved-visitor list maintained by the inmate's Unit Team. Weekends and federal holidays in most facilities; specific hours per facility.
Standard BOP format: Inmate Name & Register Number, [Facility], [Address]. No staples, polaroids, or hardcover books. Sender's full return address required.
Federal inmate funds via Western Union QuickCollect to the BOP Trust Fund. Communication via CorrLinks (TRULINCS) where the inmate has subscribed.
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Source: Wikidata + Wikipedia.
Derived signal — not a judgement. How it's calculated
What the score is responding to:
This facility scores 10. The national average across 7,437 scored United States facilities is 2 — 8 points above national average.
Same country, matched on type + security level where possible.
Higher risk than 75% of peer facilities in United States.
How many of our profile fields are populated. We surface this so families and researchers know the limits.
Under CC-BY-4.0. Include the URL and access date; the site is a living reference and entries can change.
World Prisons. (2026). Usp Marion. Retrieved July 21, 2026, from https://worldprisons.com/prisons/usp-marion
"Usp Marion." World Prisons. Accessed July 21, 2026. https://worldprisons.com/prisons/usp-marion.
@misc{worldprisons-usp-marion,
author = {{World Prisons}},
title = {Usp Marion},
year = {2026},
url = {https://worldprisons.com/prisons/usp-marion},
urldate = {2026-07-21}
}