city, Summit county, northern Utah, U.S. Founded in 1869 as a mining district in the valley between the Wasatch Range and the Uinta Plateau some 30 miles (48 km) southeast of Salt Lake City, the small city enjoyed several booms throughout the 19th and early 20th centuries but faltered during the Depression. In the 1950s local developers remade Park City as a winter sports resort, and it grew to be one of the most favoured skiing destinations in the American West. Most of the city centre was restored during that time, and Park City is now on the National Register of Historic Places. Actor Robert Redford (Redford, Robert) opened the Sundance Resort in 1969 and in 1980 founded the Sundance Institute, which, since 1988, has sponsored an internationally renowned film festival each January. Inc. 1884. Pop. (1990) 4,468; (2000) 7,371.