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Federal Correctional Institution · Marion, Illinois

FCI Marion

Security level
Medium + minimum camp
Medical care level
2 of 4
Mental health care level
2 of 4
Population
1,212
Phone
618-964-1441

Last checked: November 3, 2026 (BOP documents for this prison) Intel last checked: November 3, 2026 BOP status updated: Nov 3, 2026, 9:10 pm ET News updated: Nov 3, 2026, 9:31 am ET

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Marion at a glance

FCI Marion is a medium-security prison in Marion, Illinois, with a minimum-security satellite camp (SCP). It used to be a penitentiary, and the visiting rules (2020) and handbook (2023) still call it "USP Marion." It is about ten miles south of the town of Marion, just off Highway 148.

How many people
1,014 in the FCI and 198 at the camp (BOP, October 29, 2026).
Medical care level 2
Stable outpatients who need to see a clinician anywhere from monthly to every 6 months. Examples the BOP gives: diabetes controlled with medication, epilepsy, emphysema. Click here to read the source: BOP "Institution Care Levels for Medical Assignment," February 13, 2024 (released under FOIA 2024-03455) ↗
Mental health care level 2
Routine outpatient mental health care, or short crisis care such as suicide watch. The BOP does not post care levels on its website. This list is dated February 13, 2024 and came out through a public records request. Click here to read the source: BOP "Institution Care Levels for Medical Assignment," February 13, 2024 (released under FOIA 2024-03455) ↗
Capacity
The PREA audit lists a capacity of 981 in the FCI and 200 at the camp. The average population over the year before was 1,101 in the FCI and 191 at the camp. Click here to read the source: PREA audit report, FCI Marion (onsite January 28 to 30, 2025) ↗
Ages
FCI: 20 to 77. Camp: 24 to 70. Click here to read the source: PREA audit report, FCI Marion (onsite January 28 to 30, 2025) ↗
Average stay
FCI: 831.7 days. Camp: 425.8 days. Click here to read the source: PREA audit report, FCI Marion (onsite January 28 to 30, 2025) ↗
Sex offenders
The handbook says the BOP offers sex offender treatment at its Sex Offender Management Program institutions, which have a higher share of sex offenders in the general population. The First Step Act guide lists Marion for both sex offender treatment programs (see Programs). Click here to read the source: USP Marion Admission and Orientation Handbook (updated March 21, 2023) ↗

The BOP's own page for FCI Marion.