High Quality Content by WIKIPEDIA articles! Offshore oil and gas in the US Gulf of Mexico is a major source of oil and natural gas in the United States. The western and central Gulf of Mexico, which includes offshore Texas, Louisiana, Mississippi, and Alabama, is one of the major petroleum-producing areas of the United States. In 2007, federal leases in the western and central Gulf of Mexico produced 25% of the nation`s oil and 14% of the nation`s natural gas.