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Idaho Maximum Security Institution

Idaho Maximum Security Institution contact, address, visiting, phone, mail and travel details. Confirm custody and current rules with the responsible agency.

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Facility record · Idaho

Kuna · Ada County

STATE
Page typeState custody
  • SecurityMaximum
  • Population553
  • Occupancy101%
Call (208) 338-1635Official page ↗

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Idaho Maximum Security Institution is a state prison in Kuna, Ada County, Idaho. It has a rated capacity of 549 and a reported population of 553 — about 101% occupancy, as recorded in the February 2026 federal dataset. By capacity it is the 5th-largest of the 13 state prison records listed for Idaho with a published capacity. It is one of 11 correctional facilities in Ada County, and Idaho operates 10 state prisons in total.

Contact & details

Main switchboard(208) 338-1635
Street address
13400 S Pleasant Valley Rd
Kuna, ID 83634
Open in maps
Security levelMaximum
CountyAda County
Directory statusOpen · Feb 2026 source
Occupancy against rated capacity101%
Rated capacity 549Reported population 553

February 2026 federal directory dataset

Guides that go wider than this institution

These cover the same ground across every facility in the directory, which is what you want if the person may be moved, or if you are helping someone in a different state.

Other facilities in Ada County

Ada County JailBoise · County or city jail · MaximumAda County Juvenile Detention CenterBoise · Juvenile facility · JuvenileAda County Work Release CenterBoise · Community corrections / work release · MinimumEast Boise Community Reentry CenterBoise · State prison · MinimumIdaho Correctional Alternative Placement Program FacilityKuna · State prison · MinimumIdaho State Correctional CenterKuna · State prison · CloseIdaho State Correctional InstitutionKuna · State prison · MediumSouth Boise Women's Correctional CenterKuna · State prison · Minimum
Idaho Maximum Security InstitutionKuna · IdahoCall

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Jail411 source information preserved on 2026-09-25.Official sources appear alongside the relevant information.