Reservations in the United States, known as Indian reservations, are sovereign Native American territories that are managed by a tribal government in cooperation with the federal Bureau of Indian Affairs, a branch of the Department of the Interior, located in Washington, DC. There are 334 reservations in the United States today. As of 2008, almost a third of Native Americans in the United States live on reservations, totaling approximately 700,000 individuals. About half of all Native Americans living on reservations are concentrated on the ten largest reservations.