The county in which Sun River Montana is located is ranked as the what most populous county in Montana?
Cascade County, Montana Cascade County ("cascade" means "waterfall" in French) is a county located in the U.S. state of Montana. As of the 2010 census, the population was 81,327, making it the fifth-most populous county in Montana. Its county seat is Great Falls.
Routt County, Colorado Routt County is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 23,509. The county seat is Steamboat Springs.