Montana has 61 prisons and jails: 1.2% of the US total of 4,960. That ranks #31 by count and #1 per person (5.36 per 100,000 residents) of 51.
Source: HIFLD Prison Boundaries (U.S. Department of Homeland Security), final release, 2025. Each facility at the centre of its boundary. The Prison Policy Initiative counts 5,077 facilities (2026); counts differ by which kinds of facility are included.
Licence: U.S. government data: no copyright, free to reuse
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<iframe src="https://get-instamaps.com/embed/rankings/prisons-jails/montana" width="100%" height="440" style="border:2px solid #111" loading="lazy" title="Montana prisons and jails map — InstaMaps"></iframe>Beaverhead County Detention Center · Madison County Sheriff's Department · Powder River County Sheriff's Office · Gallatin County Reentry Program · Gallatin County Detention Center · Big Horn County Sheriff's Office / Detention Center · Yellowstone County Detention Facility · Passages Women's Community Correctional Facility · Montana Women's Prison · Alpha House Pre-Release Center · Montana Chemical Dependency Center · Butte Pre-Release / Women's Transitional Center
"Montana has 61 prisons and jails, #31 in the US by count and #1 per person (HIFLD Prison Boundaries, 2025, mapped by InstaMaps)." Free to quote with a link to this page. Population: US Census 2024 estimates.