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. Among skiers, the term "Sun Valley" refers to the alpine ski area, which consists of Bald Mountain, the main ski mountain adjacent to Ketchum. Dollar Mountain, which is adjacent to Sun Valley, is suited for novice and lower intermediate skiers.