Idaho Maximum Security Institution (IMSI) is a state prison in Kuna, Idaho, run by the Idaho Department of Correction. The state classifies it as maximum security. Federal facility data from 2020 put its capacity at about 549 beds.
Idaho Maximum Security Institution (IMSI) Address and Phone
- Facility type
- State prison
- Address
- 13400 S. Pleasant Valley Rd, Kuna, ID 83634Open in Google Maps
- Main phone
- (208) 338-1635
- Operated by
- Idaho Department of Correction
- County
- Ada County
How to Find an Inmate at Idaho Maximum Security Institution (IMSI)
People serving state sentences are listed in the state's offender search, not on county jail rosters. Search by last and first name, or by the state inmate number if you have it; the result shows where the person is held now, which can change after a transfer.
Visiting, Mail and Phone Calls
Visiting days, visitor approval, dress rules and the mailing format for letters are set by the Idaho Department of Correction and can change at short notice. Read the official facility page and call ahead before you travel.
Jails and Police Near Idaho Maximum Security Institution (IMSI)
Anyone arrested near Kuna is booked into the county jail first; a state facility only receives people after sentencing, commitment or transfer.
Other State Prisons in Idaho
Open status checked against the official idoc.idaho.gov facility listing in November 2026. Address and phone come from that listing or, where it shows none, from the federal HIFLD prison dataset. This page lists no inmates.