Summit County is a county located in the U.S. state of Utah, occupying a rugged and mountainous area. In 2010 its population was 36,324. It is part of the Salt Lake City Metropolitan Statistical Area as well as the Salt Lake City–Ogden–Clearfield Combined Statistical Area. The county is so named because it includes 39 of the highest mountain peaks in Utah. Its mean elevation is 8,388 feet (2,557 m) above sea level, which is the second-highest of any county outside of Colorado. Its county seat is Coalville and the largest city is Park City. Owing to its proximity to Salt Lake City, Park City has acquired a reputation as an upscale getaway, bringing new development to the area. - From Wikipedia, the free encyclopedia.