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.
Clark County, Washington Clark County is a county in the southwestern part of the U.S. state of Washington. As of the 2010 census, the population was 425,363, making it Washington's fifth-most populous county. Its county seat and largest city is Vancouver. It was the first county in Washington, named after William Clark of the Lewis and Clark Expedition. It was created by the provisional government of Oregon Territory on August 20, 1845, and at that time covered the entire present-day state.