Bullfrog County was a short-lived county in the U.S. state of Nevada, created by the Nevada Legislature in 1987. It consisted of an uninhabited 144-square-mile (370 km2) area around Yucca Mountain, completely enclosed by southern Nye County, the county from which it was created. Its county seat was located in Carson City, the state capital—270 miles north. Its creation was ruled in violation of the state constitution in 1989. In compliance with the ruling, the legislature dissolved Bullfrog County and retroceded its territory to Nye County.