Crow Agency is a census-designated place in Big Horn County, Montana, United States and is near the actual location for the Little Bighorn National Monument and re-enactment produced by the Real Bird family known as Battle of the Little Bighorn Reenactment. The population was 1,616 at the 2010 census. It is the governmental headquarters of the Crow Native Americans. It is also the location of the "agency offices" where the federal Superintendent of the Crow Indian Reservation and his staff interacts with the Crow Tribe, pursuant to federal treaties and statutes.
The ending scenes in the film Little Big Man were filmed in Crow Agency.
Wikipedia https://en.wikipedia.org/wiki/Crow_Agency,_Montana
Coordinates 45°36'5.908" N -107°27'40.299" E
