Refining 101

AFPM Presents American Refining




The United States is divided into five refining districts, which make up the Petroleum Administration for Defense Districts (PADDs).  The districts were created during World War II under the Petroleum Administration for War to help organize the allocation of fuels derived from petroleum products, including gasoline and diesel (or “distillate”) fuel. Although the administration was eliminated in 1946, Congress passed the Defense Production Act of 1950, which created the Petroleum Administration for Defense and used the same five districts. Today, these regions are still used for data collection purposes.

This map shows an overview of the U.S. PADDs and where refineries are located today.



PADD 1 (East Coast):

  • PADD 1A (New England): Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont.
  • PADD 1B (Central Atlantic): Delaware, District of Columbia, Maryland, New Jersey, New York and Pennsylvania.
  • PADD 1C (Lower Atlantic): Florida, Georgia, North Carolina, South Carolina, Virginia and West Virginia.

PADD 2 (Midwest): Illinois, Indiana, Iowa, Kansas, Kentucky, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, Oklahoma, South Dakota, Tennessee and Wisconsin.

PADD 3 (Gulf Coast): Alabama, Arkansas, Louisiana, Mississippi, New Mexico and Texas.

PADD 4 (Rocky Mountain): Colorado, Idaho, Montana, Utah and Wyoming.

PADD 5 (West Coast): Alaska, Arizona, California, Hawaii, Nevada, Oregon and Washington.