The Ohio Oil Company Building, at 159 N. Wolcott St. in Casper, Wyoming, was built in 1949.

Also known as the Marathon Oil Company Building, it was listed on the National Register of Historic Places in 2001.

[2] As of 1972, about 500 people were employed at the building, performing "production, geology, land acquisition, engineering, accounting, legal affairs, tax, title and lease records, environmental concerns, safety, office services, and employee relations" functions for an area including 14 states and part of Canada.

U.S. Steel acquired the Marathon Oil Company in 1972 and, in 1986, regional headquarters were transferred to Cody, Wyoming, and eventually the building was closed.

[2] The building was deemed significant for its association with "the Wyoming oil Industry and its importance to the economic development of the state as a whole and to the City of Casper in particular.