 As of the 2010 census, Oxon Hill, National Harbor and Glassmanor were delineated as separate CDPs.Oxon Hill was named for the 18th Century manor home of Thomas Addison (which burned in 1895 but was replaced by another large Georgian-style home called "Oxon Hill Manor," now publicly owned, which has a river view).The community is bisected by the Capital Beltway (I-95/495) and is near the interstate Woodrow Wilson Bridge, whose gridlocked traffic (300,000 vehicles daily) backs-up daily into Oxon Hill until the wider replacement bridge is fully completed in 2008, bringing relief.