5 States With The Largest Refining Capacity

4. Illinois

Refining Capacity: 1,038,515 b/cd

Illinois is the first state in our list with a total refining capacity that reaches above the 1 million barrels per day mark. Ranking at number 4 in our list of states with the largest refining capacity, Illinois has 4 refineries that can jointly process 1,038,515 barrels of crude oil per calendar day.