Maine has 21 prisons and jails: 0.4% of the US total of 4,960. That ranks #44 by count and #29 per person (1.49 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/maine" width="100%" height="440" style="border:2px solid #111" loading="lazy" title="Maine prisons and jails map — InstaMaps"></iframe>York County Jail · Cumberland County Jail · Maine Correctional Center · Southern Maine Women's Re-Entry Center · Two Bridges Regional Jail · Maine State Prison · Bolduc Correctional Facility · Androscoggin County Jail · Knox County Correctional Facility · Oxford County Jail · Kennebec County Jail · Waldo County Holding Facility
"Maine has 21 prisons and jails, #44 in the US by count and #29 per person (HIFLD Prison Boundaries, 2025, mapped by InstaMaps)." Free to quote with a link to this page. Population: US Census 2024 estimates.