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District of Columbia Zip Codes



District of Columbia Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the Residence Act approved the creation of a capital district located along the Potomac River on the country s East Coast. As permitted by the U.S. Constitution, the District is under the exclusive jurisdiction of the United States Congress and is therefore not a part of any U.S. state.

The states of Maryland and Virginia each donated land to form the federal district, which included the preexisting settlements of Georgetown and Alexandria; however, Congress returned the Virginia portion in 1846. Named in honor of George Washington, the City of Washington was founded in 1791 to serve as the new national capital. Congress created a single municipal government for the whole District of Columbia after the American Civil War.

Washington, D.C., had an estimated population of 617,996 in 2011, the 25th most populous place in the United States. Commuters from the surrounding Maryland and Virginia suburbs raise the city s population to over one million during the workweek. The Washington Metropolitan Area, of which the District is a part, has a population of nearly 5.6 million, the seventh-largest metropolitan area in the country.

The centers of all three branches of the federal government of the United States are in the District, including the Congress, President, and Supreme Court. Washington is home to many national monuments and museums, which are primarily situated on or around the National Mall. The city hosts 176 foreign embassies as well as the headquarters of many international organizations, trade unions, non-profit organizations, lobbying groups, and professional associations.

State Zip Code City County Area Codes
DC 20001 Washington District of Columbia 202, 771
DC 20002 Washington District of Columbia 202, 771
DC 20003 Washington District of Columbia 202, 771
DC 20004 Washington District of Columbia 202, 771
DC 20005 Washington District of Columbia 202, 771
DC 20006 Washington District of Columbia 202, 771
DC 20007 Washington District of Columbia 202, 571, 703, 771
DC 20008 Washington District of Columbia 202, 771
DC 20009 Washington District of Columbia 202, 771
DC 20010 Washington District of Columbia 202, 771
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Map of District of Columbia


ZIP codes are a system of postal codes used by the United States Postal Service (USPS) since 1963. The term ZIP, an acronym for Zone Improvement Plan, is properly written in capital letters and was chosen to suggest that the mail travels more efficiently, and therefore more quickly, when senders use the code in the postal address. The basic format consists of five decimal numerical digits. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the ZIP code, a hyphen, and four more digits that determine a more precise location than the ZIP code alone. The term ZIP code was originally registered as a servicemark (a type of trademark) by the U.S. Postal Service, but its registration has since expired.


ZIP codes designate only delivery points within the United States and its dependencies, as well as locations of its armed forces. There are no ZIP codes reserved for designating mail bound for foreign destinations (with the exception of U.S. military units stationed outside of the United States), and therefore, international outbound mail should not include a ZIP code in the delivery address. The last line of a foreign address must only show the name of the country of destination.