|Coordinates: Coordinates: |
|County||Contra Costa County|
|Elevation||203 ft (62 m)|
Oleum was an unincorporated community in Contra Costa County, California, United States, located between the City of Hercules and the unincorporated town of Rodeo. It was a small company town, with housing for Union Oil company workers, hence the name, derived from "petroleum". The refinery still exists.
- "Oleum (Contra Costa County, California)". Geographic Names Information System. United States Geological Survey. Retrieved May 11, 2014.
"FIPS55 Data: California". FIPS55 Data. United States Geological Survey. February 23, 2006. Archived from the original on June 18, 2006. Retrieved May 11, 2014. External link in
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