| a federal area in the E United States, on the Potomac, coextensive with the federal capital, Washington. 637,651; 69 sq. mi. (179 sq. km). Abbreviation: DC (for use with zip code), D.C. |
| Columbia, District of See District of Columbia. |
Dis·trict of Columbia  (dĭs'trĭkt')  Abbr. DC or D.C. A federal district of the eastern United States on the Potomac River between Virginia and Maryland. Coextensive with the city of Washington, it was established by congressional acts of 1790 and 1791 on a site selected by George Washington. |
The district occupied entirely by Washington, D.C., the capital of the United States; bordered by Maryland to the north and Virginia to the south.
Note: The District of Columbia was established by acts of Congress in 1790 and 1791 on a site selected by George Washington.