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Federal Medical Center · Ayer, Massachusetts

FMC Devens

Security level
Administrative + minimum camp
Medical care level
3, 4 of 4
Mental health care level
4 of 4
Population
1,137
Phone
978-796-1000

Last checked: November 3, 2026 (BOP documents for this prison) Intel last checked: November 3, 2026 BOP status updated: Nov 3, 2026, 11:10 pm ET News updated: Nov 3, 2026, 8:49 pm ET

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Devens at a glance

Devens is a federal medical center for men (administrative security) in Ayer, Massachusetts, with a satellite prison camp (FPC) about half a mile down the road. The visiting rules say the FMC has no non-contact visiting area. The handbook names inpatient units and mental health units inside the FMC.

How many people
1,030 in the FMC and 107 at the camp (BOP, October 29, 2026).
Medical care level 3, 4
The BOP list gives the medical center levels 3 and 4 (a "low" part is level 3 and the camp is level 2). Level 3 is people with complex, usually long-term, conditions who need frequent clinician visits, for example cancer in partial remission or advanced HIV disease. Level 4 is people who need services found only at a BOP Medical Referral Center, such as cancer on active treatment or dialysis. Click here to read the source: BOP "Institution Care Levels for Medical Assignment," February 13, 2024 (released under FOIA 2024-03455) ↗
Mental health care level 4
The BOP list gives the medical center mental health level 4. Care happens only at a Medical Referral Center, with a written treatment plan reviewed at least every 90 days and treatment or contact at least once a week. The same list gives the "low" part and the camp level 2. The BOP does not post care levels on its website. This list is dated February 13, 2024 and came out through a public records request. Click here to read the source: BOP "Institution Care Levels for Medical Assignment," February 13, 2024 (released under FOIA 2024-03455) ↗
Who is there
Men. On the first day of the 2024 audit, ages ran from 19 to 89. Click here to read the source: PREA audit report, FMC Devens (onsite October 29 to 31, 2024) ↗
Built for
1259 people. On the first day of the audit it held 1015. Click here to read the source: PREA audit report, FMC Devens (onsite October 29 to 31, 2024) ↗
Average stay
724.7 days at the main facility and 270.8 days at the camp. Click here to read the source: PREA audit report, FMC Devens (onsite October 29 to 31, 2024) ↗
Sex offender treatment
The handbook says the residential sex offender treatment program (SOTP-R) is available only at FMC Devens. Click here to read the source: FMC Devens Admission and Orientation Handbook (March 2026) ↗

The BOP's own page for FMC Devens.