Washington, DC
Washington, DC (District of Columbia) was the federal capital of the United States of America. The bordering states were Maryland and Virginia. ()

This city was home to the Smithsonian Air and Space Museum, whose collection included the first Human warp-ship Phoenix, which Captain Jean-Luc Picard visited several times. ()

In 1930, the federal government revealed the results of a survey to the public. According to the survey, there was an exodus of individuals from the The South to the cities. A journalist based in Washington wrote an article about this survey for a New York City newspaper, which was seen briefly on Spock's tricorder. ()

In an alternate timeline in which Nazi Germany had invaded the United States, as of 1944 Washington, DC was controlled by German forces. Before the federal government evacuated the city, the president made a vow to persevere. After the city's occupation, the White House became the NAZI headquarters in the United States. When the American military launched its counteroffensive, two army divisions were reported by German observers as advancing from the south on a direct course towards Washington. ()

In 1986, after unsuccessfully interrogating Pavel Chekov on board the , a FBI agent conferred with a civilian representative of the AEC. The civilian suggested that they contact people in Washington for help. ()

Like most cities on Earth, Washington was devastated by nuclear weapons during World War III. ()

In 2371, on aboard the , a disoriented and frightened Fred Noonan, after taking crew members hostage, requested that Captain Kathryn Janeway get in touch with Washington so he could personally speak with J. Edgar Hoover. ()

Background information 
The city was named after George Washington, who was a military general in the American Revolution and first President of the United States. The district was a reference to Christopher Columbus, who was a Spanish explorer.

Retroactive continuity: A map of the mid-Atlantic coast of the United States depicting the location of Washington, DC was downloaded from the  library computer by the Talosians in 2254. () This map was from educational texts available at the time of filming, .

The contours of the District of Columbia in  were seen on a map of the United States (Die Vereinigten Staaten von Amerika). The color selected for the district was a shade of blue.

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US settlements
Retconned material in background