Mount Charleston is an unincorporated town and census-designated place in Clark County, Nevada, United States. The population was 357 at the 2010 census. The town of Mount Charleston is named for nearby Mount Charleston whose Charleston Peak at 11,916 feet is the highest point in Clark County. The town of Mount Charleston is in a valley of the Spring Mountains to the northwest of Las Vegas, noted for its hiking trails. It is also known for its Retreat on Charleston Peak, a 64-room hotel.