This is a list of capital cities of the United States, including places that serve or have served as federal, state, insular area, territorial, colonial and Native American capitals.

Washington, D.C. has been the federal capital of the United States since 1800. Each U.S. state has its own capital city, as do many of its insular areas. Most states have not changed their capital city since becoming a state, but the capital cities of their respective preceding colonies, territories, kingdoms, and republics typically changed multiple times. There have also been other governments within the current borders of the United States with their own capitals, such as the Republic of Texas, Native American nations, and other unrecognized governments.

The buildings in cities identified in the chart below served either as official capitals of the United States under the United States Constitution, or, prior to its ratification, sites where the Second Continental Congress or Congress of the Confederation met. The United States did not have a permanent capital under the Articles of Confederation.

The U.S. Constitution was ratified in 1787, and gave the Congress the power to exercise "exclusive legislation" over a district that "may, by Cession of particular States, and the acceptance of Congress, become the Seat of the Government of the United States." The 1st Congress met at Federal Hall in New York. In 1790, it passed the Residence Act, which established the national capital at a site along the Potomac River that would become Washington, D.C. For the next ten years, Philadelphia served as the temporary capital. There, Congress met at Congress Hall. On November 17, 1800, the 6th United States Congress formally convened in Washington, D.C. Congress has met outside of Washington only twice since: on July 16, 1987, at Independence Hall in Philadelphia, to commemorate the 200th anniversary of ratification of the Constitution; and at Federal Hall National Memorial in New York on September 6, 2002, to mark the first anniversary of the September 11 attacks. Both meetings were ceremonial.

Each state has a capital that serves as the seat of its government. Ten of the thirteen original states and 15 other states have changed their capital city at least once; the last state to move its capital city was Oklahoma in 1910.

In the following table, the "Since" column shows the year that the city began serving as the state's capital (or the capital of the entities that preceded it). The MSA/μSA and CSA columns display the population of the metro area the city is a part of, and should not be construed to mean the population of the city's sphere of influence or that the city is an anchor for the metro area. Fields colored light yellow denote that the population is a micropolitan statistical area.

An insular area is a United States territory that is neither a part of one of the fifty states nor a part of the District of Columbia, the nation's federal district. Those insular areas with territorial capitals are listed below.

Four of the 50 U.S. states, Hawaii, Texas, California, and Vermont, were once de jure sovereign states with diplomatic recognition from the international community. California did not have a capital during its time as a sovereign nation.