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Federal Correctional Institution
Marion Medium FCI is a federal correctional institution in Marion, Illinois, housing approximately 981 people. Below you'll find insider tips, programs, visiting hours, and preparation resources.
Last verified: February 12, 2026
Facility recently reclassified; exterior signage may reflect former designation pending historical approval. Medium security federal correctional institution with adjacent minimum-security satellite camp. Email: MAR-ExecAssistant-S@bop.gov. Fax: 618-964-2058. County: Williamson. Total complex pop: 1,176.
See the full commissary list for Marion Medium FCI below, including available items and pricing.
Live as the CEO of your life at Marion Medium FCI by posting journal entries, release plans, and book reports at PrisonProfessors.org—so others can hold you accountable while you build skills and earn freedom through merit.
Marion Medium FCI is a Federal Correctional Institution. FCIs house people of varying security levels and typically offer educational, vocational, and treatment programs to support rehabilitation and reentry.
Our team of experienced advisors can help you prepare for your journey, make the most of your time, and set yourself up for a successful return.
Note: Visiting schedules may vary. Contact the facility directly for the most current visiting hours and procedures. For a complete breakdown of visitation rules, dress code, and how to get approved, visit our Visitation Guide.
With a population of approximately 981 people, Marion Medium FCI is a smaller facility — and that has real implications for daily life, programming, and how you're treated.
How Long Will You Actually Serve?
Federal sentences are not always served in full. Good time credit, the First Step Act, and RDAP can significantly reduce your time served.
4500 PRISON ROAD, MARION, IL 62959
Marion, Illinois 62959
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Estimates via OpenStreetMap. Actual travel time may vary.
Security Notice
All phone calls are recorded. All emails are saved. Mail can be read by staff.