Texas, North Dakota, and the Gulf of Mexico Account for Two-Thirds of U.S. Crude Oil Production
July 11, 2016
In 2015, the United States produced a total of 9.4 million barrels of crude oil per day (mmbd) from state and federal offshore operations. Texas produced the most petroleum by far at 3.5 mmbd followed by federal offshore operations in the Gulf of Mexico with 1.5 mmbd. North Dakota had the second highest production among other states at 1.2 mmbd. Altogether, crude oil production in Texas, North Dakota and the federal offshore areas in the Gulf of Mexico accounted for two-thirds of all U.S. crude oil production. Twenty states produced no crude oil in 2015.
U.S. Crude Oil Production by Region, 2015

Source
Information Administration, Petroleum Supply Monthly, February 2016, Table 26.