American Language 250

Standard American Almanac

United States · permanent federal-district record · DC

Flag of the District of Columbia

Washington, D.C.

District of Columbia at a glance

Classification
Federal district and seat of the government of the United States
Constitution Annotated, Seat of Government Clause · D.C. is not a state.
Federal seat established
July 16, 1790
Residence Act, 1 Stat. 130 · The Residence Act provided for the permanent seat of the federal government.
Area
61.1 sq mi land · 7.2 sq mi water
U.S. Census Bureau, District of Columbia profile ·
Area codes
202 · 771
North American Numbering Plan Administrator, Planning Letter 547 · 771 overlays the historic 202 numbering-plan area.