Washington, DC Directory
Regional Directory > States Menu > Washington, DC
Most of the organizations listed on these category pages primarily serve, and employ, the residents of Washington, DC.
In 2010, according to United States Census Bureau data, the District of Columbia had an estimated total population of 602,000, which is about 0.19 percent of the United States population. 101,000 (16.8 percent) of these residents were under 18 years of age, 432,000 (71.8 percent) were between 18 and 65 years old, and 69,000 (11.5 percent) were over 65 years old. The median age of Washington residents was 33.8 years, compared to the median age of 37.2 years for United States residents as a whole.
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Washington, DC has a land area of 68.3 square miles, and 16.2 percent of this land area is occupied by National Parks.
The state has approximately 8,814 residents per square mile.
This interactive map of Washington, DC shows the District of Columbia's roads and highways, while this map of Washington, DC and the surrounding region demonstrates the district's proximity to Maryland and Virginia.