Stafford County is a county located in the Commonwealth of Virginia. As of the 2010 census, the population was 128,961. Its county seat is Stafford.Located across the Rappahannock River from the City of Fredericksburg, Stafford County is part of the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area. In 2006, and again in 2009, Stafford was ranked as the 11th highest income county in America by Forbes magazine.