Philadelphia was the first and original capital of the United States, as well as the location of the signing of the Declaration of Independence and the Constitution.
Philadelphia, Pennsylvania
New York City was the capital of the United States from 1785 to 1790, and the site of the inauguration of George Washington as the first president.
Washington, D.C. is the current and permanent capital of the United States, established in 1790 by the Residence Act.
Baltimore was the capital of the United States for a brief period in 1776 and 1777, when the Continental Congress fled from Philadelphia due to the British occupation.
Lancaster was the capital of the United States for one day on September 27, 1777, when the Continental Congress met there after leaving Philadelphia.