Washington, D.C. Gazetteer

Washington, D.C. - Basic Information

Established: July 16, 1790
Population: 601,723 (2010 Census)
Land Area: 61.1 square miles
Population Density: 9,856.5 persons per square mile
Housing Units: 296,719 (2010 Census)
Housing Unit Density: 4,860.4 housing units per square mile
State Website: Official District of Columbia Website
Washington, D.C. State Flag
Washington, D.C. state flag

Washington, D.C. History


The area of the District of Columbia was part of the original territory of the United States. The District of Columbia was formed from territory ceded by Maryland and Virginia in 1788, and was established in accordance with Acts of Congress passed in 1790 and 1791. Its boundary, a square ten miles on a side with vertices at the cardinal points to resemble a diamond, was established on March 30, 1791, and included all of the territory within present-day Arlington County, Virginia, and part of Alexandria city, Virginia. The portion south of the Potomac River was retroceded to Virginia in 1846.

Washington, D.C. Profile

  1. Data
  2. Neighborhoods
  3. Map
  4. ZIP Codes
  5. Features
  6. Schools
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