National Harbor is a census-designated place in Prince George's County, Maryland, United States, located along the Potomac River near the Woodrow Wilson Bridge and just south of Washington. It originated as a 300-acre multi-use waterfront development. The population was 3,788 at the 2010 census.
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Official website http://www.nationalharbor.com/
Address 20745, United States
Coordinates 38°47'7.383" N -77°1'6.356" E