Pennsylvania's crude oil production revived in recent decades, recovering after a long decline from its 19th-century position as a leading producer.
According to the U.S. Energy Information Administration, in 2019 the state produced 6.6 million barrels of oil, up from 3.7 million barrels in 1981. The biggest gains in output came between between 2010 and 2015, although the state remains a minor producer among U.S. states. Texas, the largest producing state, produced 1.8 billion barrels in 2019.