Washington, D.C., ada ana kiranta da District of Columbia anfi saninta da Washington ko D.C., itace Babban birninkasar Tarayyar Amurka. Ankirkire ta bayan amuruka juyin juya hali amatsayin fadar gwamnatin sabuwar, sunan Washington ansa sane bayan sunan George Washington, Shugaban Farko Na Tarayyar Amurka kuma Wadanda suka Kafa Tarayyar Amurka. Amatsayin ta na fadar Gwamnatin Tarayyar Amurka da kuma ma'aikatu na duniya da dama, Washington nada muhimmanci a duniyar siyasa babbar birnin kasal. Birnin na daya daga cikin mafi yawan ziyarta a duniya, fiye da mutane (masu yawon bude ido) niliyan 20 ne ke ziyartar birnin a duk shekara. Sa hannun da akayi na Residence Act a July 16, 1790 ita ta bmince da kafa capital district yakasance a Potomac River a gabar kasar na East Coast. Kundin Tsarin mulkinn kassr yasamar da federal district a karkashin exclusive jurisdiction na U.S. Congress, da kuma cewar District din kafa yakasance bangaren kowace jiha. The states of Maryland and Virginia each donated land to form the federal district, which included the pre-existing settlements of Georgetown and Alexandria. The City of Washington was founded in 1791 to serve as the new national capital.