Dictionary  Dis'trict of Colum'biaa federal area in the E United States, on the Potomac, coextensive with the federal capital, Washington. 637,651; 69 sq. mi. (179 sq. km). Abbr.: DC (for use with zip code), D.C. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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