Home / Directory / Illinois / Fci Marion
FCI Marion
Find the contact details, address, facility type, and official source links Jail411 holds for FCI Marion in Illinois. Confirm current custody before acting.
Facility record / Illinois
FCI Marion is a federal prison in Marion, Williamson County, Illinois, operated by Federal Bureau of Prisons. It is one of 4 correctional facilities in Williamson County.
Jail411 does not hold custody records. A listing here does not mean anyone is held at this address. Confirm the person’s location with the responsible agency before you travel, send money, or pay for a service.
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
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.
Other facilities in Williamson County
| Facility | City | Type | Security |
|---|---|---|---|
| USP 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 | — |
Clear information.
Clear boundaries.
Jail411 is an independent information resource for families and friends. We are not a government agency, jail operator, law firm or live custody-records service.
Can Jail411 tell me if someone is in custody right now?
No. Jail411 does not hold live custody records. Use the official locator for the county, state, federal or ICE system that has the person; start here if you do not know which.
Does posting bond mean the person comes home?
Not always. A probation or parole hold, another county's warrant or an immigration detainer can keep someone in custody after bond is posted. Ask the jail what holds are on the booking before you pay.
What should I confirm before visiting?
The person's current facility, the visiting schedule, approval requirements, accepted identification and arrival instructions. Check the facility page and its official sources before you travel.
What if I find something that needs correcting?
Send us the page and the detail that needs attention. Include the official source when you have one. Do not send private booking documents or other sensitive personal information.
Plan the next step.
Practical guides for calls, visits, mail, money and release.