The company traces its heritage back to the early 1900s and oil entrepreneur Henry Latham Doherty. After quickly climbing the ladder of success in the manufactured gas and electric utility world, Doherty in 1910 created Cities Service Company to supply gas and electricity to small public utilities. He began by acquiring gas-producing properties in the mid-continent and southwest.

Cities Service Company inaugurated use of the Citgo brand in 1965 (officially styled "CITGO") for its refining, marketing and retail petroleum businesses (which became known internally as the RMT Division, for Refining, Marketing and Transportation). CITGO continued to be only a trademark, and not a company name, until the 1983 sale of what had been the RMT Division of Cities Service to Southland Corporation (now 7-Eleven Inc.).

🏢