Howdy Judy: According to the Hornbook of Virginia History, Truro Parrish was in Prince William Co., VA from 1732 thru 1742 and in Fairfax Co., VA. from 1742 on. The Pohick Church in Fairfax Co., VA begun in 1769 and completed in 1774 served Truro Parish. George Washington and George Mason were vestrymen of the Parish . Regards, Bernie in Northern Virginia