FCI Marion: inmate search, visiting and mail

Find someone at FCI Marion

We do not hold a list of the people at FCI Marion. To check whether someone is held there, search their name or 8-digit register number in the BOP inmate locator; the result shows the facility. It covers people in federal custody from 1982 to the present. Our federal inmate search guide explains the search step by step.

The BOP's population report dated October 8, 2026 counts 1,238 people at FCI Marion. People are transferred between federal prisons, so confirm the location before you travel or send anything.

About FCI Marion

FCI Marion is a Federal Correctional Institution run by the Federal Bureau of Prisons in Marion, Illinois (Williamson County). The BOP lists its security level as Medium and says it holds men, with a satellite camp. It is in the BOP's North Central Region.

Visiting

You can only visit if the person has put you on their approved visiting list and the BOP has cleared you. The person mails you a Visitor Information Form after they arrive; you fill it in and send it back. Federal law gives each person at least four hours of visiting a month, and the warden can limit visit length or the number of visitors.

Visiting days and times differ by institution and can be cancelled for safety reasons. Check the visiting information on the institution's bop.gov page and call 618-964-1441 before you leave. More in how to visit someone in prison.

Mail address

Inmate mail to FCI Marion
Inmate's full committed name and register number
FCI Marion
P.O. Box 1000
Marion, IL 62959

Use the person's committed name (no nicknames) and register number. Letters are opened and inspected by staff, except specially marked legal mail. Packages from home need written approval first; books and magazines must come straight from the publisher. See how to send mail to an inmate.

Sending money

Never send money to FCI Marion's address. All federal inmate deposits go through the BOP's national systems, whatever prison the person is in:

• MoneyGram (receive code 7932) or Western Union (code city FBOP, DC). The account number is the 8-digit register number with no spaces, then the last name (for example 12345678DOE).
• By mail: a money order or cashier's check (no cash or personal checks) to Federal Bureau of Prisons, the person's committed name and register number, Post Office Box 474701, Des Moines, Iowa 50947-0001.

Wait until the person has physically arrived at the BOP facility. Full steps in how to send money to an inmate.

Phone calls and email

Calls are monitored, and usually the person in prison pays for them. Email runs through TRULINCS: text only, up to 13,000 characters, and both sides must agree to monitoring. More in phone calls with someone in prison.

Questions

Sources

We opened each of these pages on October 14, 2026. Rules and numbers change, so check the source before you act.

• FCI Marion, Federal Bureau of Prisons. Address, phone, mail address, security level and population report (BOP location data, read on bop.gov).
• Find an inmate, Federal Bureau of Prisons. Records from 1982 to the present, search by number or name, and what "Released" or "Not in BOP Custody" means.
• General Visiting Information, Federal Bureau of Prisons. The approved visiting list, who can be on it, dress code and visiting hours.
• Stay in touch (communications), Federal Bureau of Prisons. Phone calls, TRULINCS email, mail, packages and the three ways to send money.
• About Our Facilities, Federal Bureau of Prisons. What FCI, USP, MDC, FDC, FMC, FPC and ADX stand for.