Indian Nations of Montana
Official site showcasing Montana's Indian reservations. Highlights location and economy of each tribe and lists places of tourist interest like camping grounds, museums, and tours.
Montana - Wyoming Tribal Leaders Council
Also the Fort Peck Reservation, which is home to the Assiniboine bands of Canoe Paddler and Red Bottom and the Sioux divisions of Sisseton/Wahpetons, the Yantonais, and the Teton Hunkpapa.