'Washington, DC' definitions:

Washington, DC -- U.S. city in District of Columbia

From: Gazetteer 2000
Name :
Washington, DC -- U.S. city in District of Columbia
Population (2000) :
572059
Housing Units (2000) :
274845
Land area (2000) :
61.403254 sq. miles (159.033692 sq. km)
Water area (2000) :
6.937868 sq. miles (17.968995 sq. km)
Total area (2000) :
68.341122 sq. miles (177.002687 sq. km)
FIPS code :
50000
Located within :
District of Columbia (DC), FIPS 11
Location :
38.913611 N, 77.013222 W
ZIP Codes (1990) :
20001 20002 20003 20004 20005 20006
Note :
some ZIP codes may be omitted esp. for suburbs.