Arlington

Arlington commonly refers to Arlington County, Virginia, in the United States, a densely populated urban county in the Northern Virginia portion of the Washington, D.C. metropolitan area. Located across the Potomac River from Washington, D.C., it is bordered by Fairfax County to the west and the independent city of Alexandria to the south. The county was created in 1789 as Alexandria County and renamed Arlington County in 1920. It has a population around 230,000–240,000 residents and a high density for a county in the United States.

Arlington hosts several nationally significant sites, including the Pentagon and Arlington National Cemetery. The county also contains major business districts such as Crystal City, Rosslyn, Ballston, and Courthouse, with a mix of government offices, defense contractors, technology firms, and research facilities. Public transit is provided by the Washington Metro, with Blue, Orange, and Silver Line access, supplemented by a comprehensive bus network. The economy is heavily influenced by federal government activity and related industries. Notable educational institutions include Marymount University and the Arlington campus of George Mason University.

The name Arlington originates from Arlington House, the Custis family mansion on the border of the county, and the area was renamed Arlington County in the 20th century.

Elsewhere in the United States, Arlington refers to several places, most notably Arlington, Texas, a large city in Tarrant County, and Arlington, Massachusetts, a historic suburb of Boston.