The skylines of Arlington's Courthouse and Rosslyn neighborhoods, with the Georgetown and Downtown neighborhoods of Washington, D. Arlington County is a county in the Commonwealth of Virginia coterminous with the U. Census Bureau's census-designated place of Arlington, which is the second-largest principal city of the Washington metropolitan area in the United States.
The county accounts for most of Virginia's border with the District.
At the same time, an active abolitionist movement arose in Virginia that created a division on the question of slavery in the Virginia General Assembly.
(Ultimately, the name is a variant of Harlington, London, seat of the first Baron of Arlington; it in turn derives from Hygerǣd, an Anglo-Saxon noble's name.) George Washington Parke Custis, grandson of First Lady Martha Washington, acquired this land in 1802.The Union loyalists who lived in rural areas outside the town of Alexandria rejected secession.