The flags of the U.S. states, territories, and the District of Columbia exhibit a variety of regional influences and local histories, as well as different styles and design principles. Modern U.S. state flags date from the turn of the 20th century, when states considered distinctive symbols for the 1893 World's Columbian Exposition in Chicago, Illinois. Most U.S. state flags were designed and adopted between 1893 and World War I.

The official flag of New Mexico, a subnational polity of the United States, consists of a red sun symbol of the Zia people on a field of gold (yellow). It was officially adopted in 1925 to highlight the state's Native American and Hispano heritage: It combines a symbol of the Puebloan people, who have ancient roots in the state, with the colors of the flag of Spain, which established and ruled Nuevo México for over two and a half centuries.