Washington, D.C. — LLMpedia

Washington, D.C.
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Name	Washington, D.C.
Settlement type	Federal district and capital city
Nickname	D.C., The District
Motto	Justitia Omnibus (Justice for All)
Subdivision type	Country
Subdivision name	United States
Established title	Residence Act
Established date	July 16, 1790
Established title1	Organized
Established date1	1801
Established title2	Home Rule Act
Established date2	1973
Founder	George Washington
Named for	George Washington, Christopher Columbus
Seat type	Mayor
Seat	Muriel Bowser
Government type	Mayor–council
Leader title	Mayor
Leader name	Muriel Bowser (D)
Leader title1	D.C. Council
Leader name1	Phil Mendelson (D)
Area total km2	177.0
Area total sq mi	68.34
Area land km2	158.1
Area land sq mi	61.05
Area water km2	18.9
Area water sq mi	7.29
Elevation m	20
Elevation ft	66
Population total	689,545
Population as of	2020
Population density km2	4,361.5
Population density sq mi	11,294.0
Timezone	EST
Utc offset	−5
Timezone DST	EDT
Utc offset DST	−4
Postal code type	ZIP Code
Postal code	20001–20098, 20201–20599
Area code	202
Website	dc.gov

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Washington, D.C. is the capital city and federal district of the United States. Located on the east bank of the Potomac River, it serves as the seat of the federal government and numerous international institutions. The city is defined by iconic neoclassical monuments and museums, including the White House, the United States Capitol, and the Supreme Court of the United States. As a global political hub, it hosts the headquarters of major organizations like the World Bank, the International Monetary Fund, and the Organization of American States.

History

The city's creation was authorized by the Residence Act of 1790, following a compromise between Thomas Jefferson and Alexander Hamilton known as the Compromise of 1790. President George Washington chose the exact site, and the initial design was developed by Pierre Charles L'Enfant. The district was formed from land donated by the states of Maryland and Virginia, though the Virginia portion was later retroceded via the Retrocession Act of 1846. The city was burned by British Army forces during the War of 1812 in the Burning of Washington. It grew significantly after the American Civil War and was formally organized under the District of Columbia Organic Act of 1871. The Twenty-third Amendment to the United States Constitution, ratified in 1961, granted its residents votes in presidential elections, and limited self-governance was achieved through the District of Columbia Home Rule Act of 1973.

The district covers 68.34 square miles, bordered by Maryland to the north, east, and west and Virginia across the Potomac River to the south. Its topography includes the Atlantic coastal plain and the fall line, with the highest natural point being Fort Reno Park. The city is centered on the National Mall, a large open parkland stretching from the Lincoln Memorial to the United States Capitol. Major waterways include the Potomac River and its tributary, the Anacostia River, which converge at Hains Point. The district is divided into four quadrants—Northwest, Northeast, Southeast, and Southwest—radiating from the United States Capitol.

As the national capital, the district is the seat of the Federal government of the United States, housing all three branches: the Congress in the United States Capitol, the executive branch led by the President of the United States in the White House, and the Supreme Court of the United States. It is not a state and lacks voting representation in Congress, with a non-voting Delegate in the House of Representatives. Local governance is provided by an elected Mayor of the District of Columbia and the Council of the District of Columbia, though Congress retains ultimate authority. The district is overwhelmingly supportive of the Democratic Party, having voted for its presidential candidates in every election since 1964.

The 2020 United States Census recorded a population of 689,545. The district has a diverse population, with significant African American, White, Hispanic or Latino, and Asian communities. Major ethnic neighborhoods include Chinatown and the U Street Corridor, historically known as "Black Broadway." The city is also home to large international communities due to the presence of embassies, such as those on Embassy Row, and institutions like the World Bank. Religious affiliation is varied, with notable landmarks including the Washington National Cathedral and the Basilica of the National Shrine of the Immaculate Conception.

The economy is dominated by the federal government, which is the largest employer, including agencies like the Department of Defense and the Department of Health and Human Services. A major sector is professional services, including law firms, lobbying groups, and defense contractors such as Lockheed Martin and Northrop Grumman. Tourism is a significant industry, centered on the National Mall and institutions like the Smithsonian Institution and the National Gallery of Art. The city is also a hub for media and journalism, hosting major outlets like The Washington Post, NPR, and C-SPAN. The presence of international financial institutions like the International Monetary Fund and the World Bank Group further anchors the global economic profile.