Washington, District of Columbia (often shortened to Washington, D.C. or Washington) is the capital city of the United States of America.
- Population: 646,229 (2013 estimate, ranked 24th)
- State: Federal capital district
The city is located on the confluence of the Potomac and Anacostia Rivers. It is also located within the District of Columbia, the federal capital district of the United States of America, though the city's territorial jurisdiction corresponds with that of the district's.