Richfield Oil Corporation
Richfield Oil Corporation was an American petroleum company based in California from 1905 to 1966. In 1966, it merged with Atlantic Refining Company to form the Atlantic Richfield Company.
A Richfield service station located in Tucson, Arizona, July 1939
ARCO is a brand of gasoline stations owned by Marathon Petroleum. BP, which formerly owned the brand, uses it in Northern California, Oregon and Washington, while Marathon has rights for the rest of the United States and Mexico.
At one time, ARCO had its headquarters in what is now the City National Plaza complex in Downtown Los Angeles
An ARCO filling station off Slauson Avenue in Los Angeles, California (2005)
An ARCO station in St. Clairsville, Ohio in 2021, well out of ARCO's traditional marketing territory and in the home state of Marathon.