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As of the 2010 census, the population was 139,966, and in 2014, the population was estimated to be 150,575. Located along the western bank of the Potomac River, Alexandria is approximately 7 miles (11 km) south of downtown Washington, D.C.
Arlington County, Virginia Federal Census. Established 1801 as Alexandria Co. of the District of Columbia; retroceded to VA in 1846; organized as VA county of Alexandria 1847; name changed to Arlington in 1920. The City of Alexandria has since displaced part of Arlington Co. Year.