The Mariposa County Juvenile Hall is a special-purpose 96-hour detention facility operated by the Probation Department for youth who have committed offenses prior to their eighteenth birthday. The county states that the Chief Probation Officer is the local authority for the hall and that the Superintendent or designee manages day-to-day operations.

Because of the facility’s special-purpose designation, youth requiring detention are transported to full-service juvenile halls in Tuolumne, Madera, or Kern County. Public administrative contact for juvenile hall matters runs through the Mariposa County Probation Department at 5091 Bullion St., Mariposa, CA 95338, by phone at (209) 966-3612.