The Prince William Board of County Supervisors is the policy-making body for the government of Prince William County, Virginia. The county is divided into seven magisterial districts: Brentsville, Coles, Gainesville, Neabsco, Occoquan, Potomac, and Woodbridge. The magisterial districts each elect one supervisor to the Board of Supervisors. There is also a Chairman elected by the county at-large, b... Wikipedia