Rock Springs is a city located in Sweetwater County, Wyoming, United States. It is the county seat of Sweetwater County. The city has a population of approximately 23,154 people as of the 2010 census. Rock Springs is known for its coal mining industry and is often referred to as the "Energy Capital of the Nation." It is also a major hub for outdoor recreation, with nearby attractions such as Flaming Gorge National Recreation Area and Killpecker Sand Dunes.