The Fort Peck Agency of the Bureau of Indian Affairs is responsible for the Fort Peck Indian Reservation is located near Wolf Point, Montana.
The agency is responsible for 12,000 Assiniboine and Sioux enrolled tribal members and the reservation contains about 2,094,000 acres of land within its exterior boundary. There are about 939,165 acres of tribal and allotted surface trust acreage that includes Turtle Mountain Public Domain lands.