Federal prisons in Illinois
The Federal Bureau of Prisons runs 5 prisons in Illinois. Pick one for its visiting hours and rules, the inmate mailing address, how to send money, what to wear, and the latest news. Not sure where your loved one is? Search the federal inmate locator.
| Prison | Security | City | People |
|---|---|---|---|
| FCI Greenville with a minimum-security camp |
Medium | Greenville | 1,260 |
| FCI Marion with a minimum-security camp |
Medium | Marion | 1,212 |
| FCI Pekin with a minimum-security camp |
Medium | Pekin | 1,313 |
| FCI Thomson with a minimum-security camp |
Low | Thomson | 2,118 |
| MCC Chicago | Administrative | Chicago | 553 |
Population from the BOP's own count, checked November 5, 2026.