Sun Valley is a resort city in the western United States, in Blaine County, Idaho, adjacent to the city of Ketchum in the Wood River valley. The …Sun Valley is a resort city in the western United States, in Blaine County, Idaho, adjacent to the city of Ketchum in the Wood River valley. The population was 1,783 at the 2020 census. The elevation of Sun Valley is 5,920 feet above sea level.
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