Wyoming has the smallest population of any state–only Alaska has fewer residents per square mile. The state is the largest coal producer in the nation and also produces natural gas and petroleum. Wyoming supplies more energy to the nation and has more producing federal oil and gas leases than any other state. The largest industry in Wyoming is energy extraction. Fossil fuels are produced in 22 of Wyoming’s 23 counties. Mineral royalties, severance, and related taxes typically provide a substantial portion of the state’s revenues.