Citgo started as the Cities Service Oil Company in 1910. In the 1980s PDVSA, the Venezuelan oil company, bought the company. Before 2006, 7-Eleven convenience stores had a 20-year contract with Citgo. That came to an end in autumn 2006.
The name "Citgo" (stylized as CITGO) was first used during the early-to-mid 1960s.
- "Exclusive: Russia and Venezuela". Reuters. Retrieved November 10, 2018.
- "Venezuelan Oil Company Gave Cash to Trump Presidential Inauguration". BBC News. Retrieved November 10, 2018.
- "Governor, Citgo Exec to Meet to Discuss". Journal Reader. Retrieved November 10, 2018.