O'Brien is an unincorporated community in Shasta County, California, United States. O'Brien is located along Interstate 5 16 miles (26 km) north of Redding. O'Brien has a post office with ZIP code 96070, which was established in 1945. The community is named after Con O'Brien, who had a resort in the community.
- U.S. Geological Survey Geographic Names Information System: O'Brien, California
- ZIP Code Lookup
- Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Quill Driver Books. p. 287. ISBN 1-884995-14-4.