Capital: Arlington
Origin and Formation of the County: Annexed from Washington, DC
Population: 220,565 inhabitants
Area: 26 sq mi


Arlington County is an urban county located in the Commonwealth of Virginia, in the United States, separated from Washington, D.C. by the Potomac River. Originally part of the District of Columbia, the land now occupied by the county was returned to Virginia on July 9, 1846 through an act of Congress that took effect in 1847.
Is Arlington part of DC or Virginia?
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Which city is close to Arlington VA?