Flathead County Detention Center
Flathead County Detention Center
County Jail / Adult Detention FacilityMailing Address
[Inmate / Resident Full Name]
Flathead County Detention Center
920 S. Main Street, Suite 100, Kalispell, MT 59901
Flathead County Detention Center
920 S. Main Street, Suite 100, Kalispell, MT 59901
Physical Address
920 S. Main Street, Suite 100, Kalispell, MT 59901
Governing Agency
Flathead County Sheriff's Office
Inmate ID
Inmate / Booking ID — Not required
Last Verified
September 27, 2026
Facility Mailing and Service Information
Use the incarcerated person's full legal name and a complete sender return address. Verify current Flathead County Detention Center mail rules before sending correspondence.
Last verified: September 27, 2026
Verify current photo size, quantity and content restrictions before sending photographs.
Last verified: September 27, 2026
Verify current book, publication and package rules before sending.
Last verified: September 27, 2026
Do not mail cash unless explicitly permitted. Use the facility's current approved inmate-account deposit method.
Last verified: September 27, 2026
Verify current visitor approval, identification and scheduling requirements before travel.
Last verified: September 27, 2026
How to Address Your Letter
Use the incarcerated person's full legal name and a complete sender return address. Verify current Flathead County Detention Center mail rules before sending correspondence.
About Flathead County Detention Center
Flathead County Detention Center is a Montana correctional, community corrections, county jail or youth facility record reviewed for current status and mail routing on 2026-09-27.