Highlights from the top oil-producing states in 2011 included:
- Texas. The Eagle Ford shale formation in south Texas contributed to gains in the state's oil production, which averaged 1,425 thousand barrels per day (bbl/d), the highest level since 1997.
- Alaska. Oil production fell for the ninth year in row, averaging 563 thousand bbl/d.
- California. Oil production averaged 535 thousand bbl/d, the lowest level in at least three decades.
- North Dakota. Preliminary data indicate increasing oil production from the Bakken formation pushed North Dakota ahead of California in December as the third biggest oil-producing state. North Dakota's oil production averaged 535 thousand bbl/d in December 2011 and 419 thousand bbl/d for the year.
- Oklahoma. Oil production averaged 204 thousand bbl/d during 2011, topping 200 thousand bbl/d for the first time since 1998. (DOE-EIA)