Elkhorn Treatment Center is a state correctional facility in Boulder, Montana, run by the Montana Department of Corrections. Federal facility data from 2020 put its capacity at about 42 beds.
Elkhorn Treatment Center Address and Phone
- Facility type
- State correctional facility
- Address
- P.O. Box 448, Boulder, MT 59632Open in Google Maps
- Main phone
- (406) 447-5300
- Operated by
- Montana Department of Corrections
- County
- Jefferson County
How to Find an Inmate at Elkhorn Treatment Center
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 Montana Department of Corrections and can change at short notice. Read the official facility page and call ahead before you travel.
Jails and Police Near Elkhorn Treatment Center
Anyone arrested near Boulder is booked into the county jail first; a state facility only receives people after sentencing, commitment or transfer.
Other State Correctional Facilities in Montana
Open status checked against the official cor.mt.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.