Mount Vernon was the plantation home of George Washington, first President of the United States. The estate is situated on the banks of the Potomac River in Fairfax County, Virginia, near Alexandria, across from Prince George's County, Maryland. The Washington family had owned land in the area since the time of Washington's great-grandfather in 1674, and in 1739 embarked on an expansion of the estate that continued under George Washington, who came into possession of the estate in 1754, but did not become its sole owner until 1761.