Washington, D.C., is the capital city of the United States of America. "D.C." stands for the District of Columbia, the federal district containing the city of Washington. The city is named after George Washington, military leader of the American Revolution and the first President of the United States. The District is named after Christopher Columbus which is where the word Columbia is derived from.
Birthplaces of United States vice-presidents
The District of Columbia and the city of Washington are coextensive and are governed by a single municipal government, so for most practical purposes they are considered to be the same entity (this was not always the case, though, as there were multiple jurisdictions within the district as late as 1871, when Georgetown ceased to be a separate city within the District). However, although there is a municipal government and a mayor, Congress has the supreme authority.
More on [ Washington, D.C. ]

American Physical Therapy Association District of Columbia - APTADC - Works to further the profession's role in the prevention, diagnosis, and treatment of movement dysfunctions and the enhancement of the physical health and functional abilities of members of the public. Includes membership information.
District of Columbia Metropolitan Area Dietetic Association - Local affiliate of the American Dietetic Association, an association of dieticians and other nutrition professionals. Site includes newsletter, events calendar, and Web links.
District of Columbia Psychological Association - DCPA - Works to advance psychology as a science and a profession and as a means of promoting human welfare. Includes history, FAQ, position announcements, academic and research information, events and membership information.
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