The New Hampshire State Prison for Men is the state's oldest prison facility. The original state prison was built in 1812. A new facility was constructed in 1878. Following extensive renovations and new construction in the 1980s, this facility remains in use today. The NH State Prison for Men is a multi-security level male-only facility with the capacity of 1,205. The New Hampshire State Prison for Men (NHSP/M) in Concord provides housing for three classification levels of male offenders ranging from general population (C3) to maximum security (C5). In addition, all male inmates newly incarcerated in the NHDOC system are processed through the Reception and Diagnostic Unit (R&D).