ARCO (/ˈɑːrkoʊ/ AR-koh) is a brand of gasoline stations owned by Marathon Petroleum. BP, which formerly owned the brand, uses it in California, Oregon and Washington, while Marathon has rights for the rest of the United States and Mexico.
ARCO was established in 1966 as the Atlantic Richfield Company, an independent oil and gas company formed from the merger of Atlantic Petroleum and the Richfield Oil Corporation.