Graham Correctional Center is a Level 4 medium-security adult male state prison in Hillsboro, Illinois. The prison opened in 1980 with a capacity of 750 inmates. The current capacity of the prison is 974, though the average daily population is 1,906. The prison's warden is Brian Foster. Graham Correctional Center consists of 50 buildings located on 117 acres. It houses a residential sex offender program and substance abuse treatment as well as vocational and academic classes for prisoners.