Washington, D.C., is the capital of the United States. In 1800, the federal government moved to Washington, D.C. D.C. stands for District of Columbia. Senators and representatives meet at the Capitol building in Washington, D.C., to make laws. The President lives and works in the White House in Washington, D.C. Supreme Court justices make decisions at the Supreme Court building in Washington, D.C. Washington, D.C., is the capital of the United States.