The Fort Belknap Reservation, encompassing 1,200 square miles, or about 638,000 acres. It is home to about 3,500 members of the Assiniboine and Gros Ventre tribes. 

Blackfeet Indian Reservation is an Indian reservation and headquarters for the Siksikaitsitapi people in the United States.

Rocky Boy's Indian Reservation n 1916, it was originally intended for landless Chippewa (Ojibwe) Indians in the American West, but has grown to include many Cree (Nēhiyaw) and Métis over the years

The Flathead Indian Reservation is home to the Confederated Salish and Kootenai tribes are a combination of the Salish, the Pend d'Oreille and the Kootenai. Of the approximately 7,753 enrolled tribal members,

Crow Agency is located in Montana near Little Big Horn with a population of 1,616 in the 2010 Census.

The Fort Belknap Indian Reservation is shared by two Native American tribes, the Gros Verde and Assinoboine Nakoda Sioux.

The Gros Ventre call themselves the White Clay People which is located on the   Fort Peck  reservation.  They share the reservation in a tribal council combining the Assinoboine Indians.

The Little Shell Tribe of Chippewa Indians is a band of the Chippewa Indians headquartered in Great Falls, Montana. The Little Shell enrollment total is 4,500 tribal members.

The Northern Cheyenne Indian Reservations (Tsėhéstáno in Cheyenne, formerly named the Tongue River Indian Reservation) is home of the federally recognized Northern Cheyenne Tribe. Located in southeastern Montana