Concord Prison Outreach partners with the Massachusetts Department of Correction (DOC) to provide programming across eight sites. The DOC oversees the state prison system and manages incarcerated people in 12 state correctional facilities. Each prison is assigned a security level based on the population’s perceived safety risk. There are four levels: maximum, medium, minimum, and pre-release (Prison Security Levels). CPO volunteers facilitate programs at the following DOC sites and at Middlesex Jail & House of Correction (MHOC), a county-jail in Billerica. This site houses men awaiting trial and serving sentences up to 2.5 years.