Kemmerer, Wyoming

Kemmerer is a city in and the county seat of Lincoln County, Wyoming, United States. The population was 2,415 at the 2020 census. Founded in 1897, the town grew up around the coal mines of the Ham's Fork field. The town was struck by one of the worst mining disasters in Wyoming history in 1923, and in the 2020s it became the site of TerraPower's Natrium reactor, the first utility-scale advanced nuclear power plant to begin construction in the United States.

In 1902 James Cash Penney opened his first Golden Rule Store in Kemmerer, the origin of the J. C. Penney chain; the store and Penney's house form a National Historic Landmark district. Kemmerer lies in the fossil-rich Green River Formation country about 15 miles (24 km) east of Fossil Butte National Monument.