<P> Petroleum in the United States has been a major industry since shortly after the oil discovery in the Oil Creek area of Titusville , Pennsylvania in 1859 . The petroleum industry includes exploration for , production , processing ( refining ) , transportation , and marketing of natural gas and petroleum products . As of 2008 , the U.S. was the world 's third - largest oil producer ( after Saudi Arabia and Russia ) , producing 8.5 million barrels of oil and natural gas liquids per day . The leading oil - producing area in the United States in 2014 was Texas ( 3.17 million barrels ( 504,000 m ) per day ) , followed by the federal zone of the Gulf of Mexico ( 1.40 million barrels ( 223,000 m ) per day ) , followed by North Dakota ( 1.09 million barrels ( 173,000 m ) per day ) and California ( 0.50 million barrels ( 79,000 m ) per day ) . </P>
<P> Petroleum in the United States has been a major industry since shortly after the oil discovery in the Oil Creek area of Titusville , Pennsylvania in 1859 . The petroleum industry includes exploration for , production , processing ( refining ) , transportation , and marketing of natural gas and petroleum products . As of 2008 , the U.S. was the world 's third - largest oil producer ( after Saudi Arabia and Russia ) , producing 8.5 million barrels of oil and natural gas liquids per day . The leading oil - producing area in the United States in 2014 was Texas ( 3.17 million barrels ( 504,000 m ) per day ) , followed by the federal zone of the Gulf of Mexico ( 1.40 million barrels ( 223,000 m ) per day ) , followed by North Dakota ( 1.09 million barrels ( 173,000 m ) per day ) and California ( 0.50 million barrels ( 79,000 m ) per day ) . </P>
where does most of americas oil come from
where does most of americas oil come from
Texas
Texas