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USP Marion
Find the contact details, address, facility type, and official source links Jail411 holds for USP Marion in Illinois. Confirm current custody before acting.
Facility record / Illinois
USP Marion is a federal prison in Marion, Williamson County, Illinois. It has a rated capacity of 1,129 and a reported population of 1,129 — about 100% occupancy, as recorded in the February 2026 federal dataset. By capacity it is the 1st-largest of the 9 federal prison records listed for Illinois with a published capacity. It is one of 4 correctional facilities in Williamson County.
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Where this record came from. The contact, status and security fields, with capacity and population, come from the HIFLD and Federal Bureau of Prisons directory release refreshed February 2026. They describe the record, not today’s population. Check the facility’s current official website.
Contact this facility
- Phone
- (618) 964-1441
- Address
- 4500 Prison Road
Marion, IL 62959Open in maps - Official page
- Official page at bop.gov
- County
- Williamson County
Facility details
Capacity
1,129 people in a facility designed for 1,129
As of the February 2026 federal dataset.
Listed as open in the February 2026 directory release.
Finding someone
Federal Bureau of Prisons inmate locator
Before you travel, pay, or mail anything
Get two things first: which facility the person is actually in, and their booking or ID number. Almost nothing works without them. Then check this facility’s current instructions — rules and service providers change.
Camps and annexes
Other facilities in Williamson County
| Facility | City | Type | Security |
|---|---|---|---|
| FCI Marion | Marion | Federal prison (Bureau of Prisons) | Medium |
| USP Marion Camp | Marion | Federal prison (Bureau of Prisons) | Minimum |
| Williamson County Jail | Marion | County or city jail | — |
Información clara.
Límites claros.
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