The Upper Sioux Indian Reservation (or Pezihutazizi in Dakota) is located in Minnesota Falls Township along the Minnesota River in eastern Yellow Medicine County, Minnesota, five miles (8 km) south of Granite Falls. It was created in 1938 when 746 acres (3 km²) of land were returned to the tribe. Most of the land along the river valley had been taken from the Dakota following the Dakota War of 1862. As of the 2000 census, the reservation recorded a resident population of 57 persons. Its land area is currently 1.984 sq mi (5.139 km², or 1,270 acres).
The tribe operates the Prairie's Edge Casino Resort. Every August, the Upper Sioux community holds its Pejhutazizi Oyate traditional wacipi (pow-wow).
Coordinates: 44°45′38″N 95°30′18″W / 44.76056°N 95.50500°W