Bullfrog County was an uninhabited county in the U.S. state of Nevada created by the Nevada Legislature in 1987. It comprised a 144-square-mile (370 km2) area around Yucca Mountain enclosed by Nye County, from which it was created. Its county seat was located in the state capital of Carson City 270 miles (430 km) away, and its officers were appointed by the governor rather than elected.

Nevada is a landlocked state in the Western region of the United States. It borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the 7th-most extensive, the 32nd-most populous, and the 9th-least densely populated of the U.S. states. Nearly three-quarters of Nevada's people live in Clark County, which contains the Las Vegas–Paradise metropolitan area, including three of the state's four largest incorporated cities. Nevada's capital is Carson City. Las Vegas is the largest city in the state.