According to EIS's 2004 Annual Report on U.S. Oil and Natural Gas reserves, the United States had 21.4 billion barrels of proved oil reserves as of December 31, 2004, the eleventh highest in the world. These reserves were concentrated overwhelmingly (over 80 percent) in four states.

Texas had 22 percent of total US oil reserves, Louisiana had 20 percent, Alaska 20 percent, and California 18 percent (note: all of these figures include onshore plus Federal and state offshore reserves). U.S. proven oil reserves have declined more than 17 percent since 1990, with the largest single-year decline (1.6 billion barrels) occurring in 1991.

U.S. Crude Oil production, which declined following the oil price collapse of late 1985/early 1986, leveled off in the mid-1990s, and began falling again following the sharp decline in oil prices of late 1997/early 1998. During 2004, the United States produced around 7.6 million barrels per day (bbl/d) of oil, of which 5.4 million bbl/d was crude oil, 1.8 million bbl/d was natural gas liquids and 0.4 million bbl/d was other liquids. This compares to the 10.6 million bbl/d averaged during 1985. U.S. crude oil production, which averaged 5.4 million bbl/d during the first eight months of 2005, is now at 50-year lows.

The United States contains over 500,000 producing oil wells, the vast majority of which are considered "marginal" or "stripper" wells, generally producing only a few barrels per day of oil. During 2004, top oil producing areas included the Gulf of Mexico (1.5 million bbl/d), Texas onshore (1.1 million bbl/d), Alaska's North Slope (886,000 bbl/d), California (656,000 bbl/d), Louisiana onshore (228,000 bbl/d), New Mexico (176,000 bbl/d), Oklahoma (171,000 bbl/d), and Wyoming (141,000 bbl/d).

Source: Energy Information Administration