The county in which Sun River Montana is located is ranked as the what most populous county in Montana?
Sun River, Montana Sun River is a census-designated place (CDP) in Cascade County, Montana, United States. The population was 124 at the 2010 census. It is part of the Great Falls, Montana Metropolitan Statistical Area.
Thompson Falls, Montana Thompson Falls is a city in and the county seat of Sanders County, Montana, United States. The population was 1,313 at the 2010 census.