Which western state is the leader in oil production?

Texas is the leader in the oil production.

In the United States, the highest ranked is Texas. It's no surprise that Texas is the largest domestic producer of oil as this state has had a culture associated with the oil business for more than century. In January 2011, crude oil production in Texas averaged 962,338 barrels a day. Like other areas of the United States, this production peaked a generation ago and then entered a long-term decline.