 As an unincorporated area, North Potomac's boundaries are not officially defined.However, the United States Census Bureau recognized a North Potomac in the 1970 census, and then as a census-designated place (North Potomac CDP) in every census since 1990.As of the 2010 census, North Potomac is located north of the Potomac River in west central Montgomery County, roughly from Washington, D.C.