<P> Petroleum refining in the United States in 2013 produced 18.9 million barrels per day of refined petroleum products, more than any other country . Although the US was the world's largest net importer of refined petroleum products as recently as 2008, the US became a net exporter in 2010, and in 2014 was the largest exporter and the largest net exporter of refined petroleum . As of January 2015, there were 137 operating refineries in the US, distributed among 30 states . </P> <P> Largest petroleum refining companies in the United States </P>

Number of oil refineries in the united states