PADD is a term used to describe different refining regions in the US.  The term was created by the US government and is the regional definition used by US government agencies when collecting and publishing industry data.

The PADD definitions are:

PADD 1 - East Coast 

• PADD 1-A (New England) : Maine, Vermont, New Hampshire, Massachusetts, Rhode Island, Conneticutt  

• PADD 1-B (Central-Atlantic): New york, New Jersey, Pennsylvania, Delaware, Maryland

• PADD 1-C (Lower Atlantic): West Virginia, Virginia, North Carolina, South Carolina, Georgia, Florida

PADD 2 - Midwest - North Dakota, South Dakota, Nebraska, Kansas, Oklahoma, Minnesota, Iowa, Missouri, Wisconsin, Illinois, Michigan, Indiana, Ohio, Kentucky, Tennessee

PADD 3 - Gulf Coast - New Mexico, Texas, Arkansas, Louisiana, Mississippi, Alabama

PADD 4 - Mountains - Idaho, Montana, Wyoming, Colorado, Utah

 PADD 5 - West Coast - California, Arizona, Nevada, Oregon, Washington, Hawaii,