Arlington County, Virginia area. The county is situated in Northern Virginia on the southwestern bank of the Potomac River directly across from Washington, D.C., of which it was once a part. With a land area of , Arlington is the geographically smallest self-governing county in the U.S., and by reason of state law regarding population density, has no incorporated towns within its borders. Due to the county's proximity to downtown Washington, D.C., Arlington is home to many important installations for the capital region and U.S. government, including the Pentagon, Reagan National Airport, and Arlington National Cemetery. Many schools and universities have campuses in
Lyon Village, Arlington, Virginia Lyon Village, Arlington, Virginia Lyon Village is a neighborhood, or "urban village" located in Arlington County, Virginia, along Lee Highway (U.S. Route 29). It adjoins Arlington County's government center (including the courthouse and police/jail complex), and is approximately one mile west of Rosslyn and less than a mile north of Clarendon, of which it is sometimes considered a sub-neighborhood, as is Cherrydale, the mostly residential district immediately west of Lyon Village. The Lyon Village Historic District encompasses 1,073 contributing buildings and 1 contributing structure. The District as a "cohesive residential neighborhood in northern Arlington County, Virginia, located immediately north of