Arlington County, or simply Arlington, is a county in the U.S. state of Virginia. The county, which is located in the Washington metropolitan area and the broader Northern Virginia region, is positioned directly across the Potomac River from Washington, D.C., the national capital, on the river's southwestern bank. The smallest self-governing county in the United States by area, Arlington County has both suburban and urbanized districts. Its urban areas are located in proximity to several Washington Metro stations and lines. Arlington's seat of government is located in the Court House neighborhood, which hosts many of its administrative offices and the county courthouse.