June 1998 Primary Election, U.S. Senate: Orange County
| Candidate | Party | County total | Percent, party | Percent, total |
| Barbara Boxer | Dem-Inc | 140899 | 91.53% | 30.12% |
| John Pinkerton | Dem | 13046 | 8.47% | 2.79% |
| John M Brown | Rep | 4584 | 1.54% | 0.98% |
| Linh Dao | Rep | 5107 | 1.72% | 1.09% |
| Matt Fong | Rep | 110812 | 37.22% | 23.69% |
| Darrell Issa | Rep | 139872 | 46.98% | 29.90% |
| Mark Raus | Rep | 5675 | 1.91% | 1.21% |
| Frank D Riggs | Rep | 31647 | 10.63% | 6.76% |
| H Joseph Perrin, Sr | AI | 1581 | 100.00% | 0.34% |
| Ted Brown | Lib | 6021 | 100.00% | 1.29% |
| Brian M Rees | NL | 2196 | 100.00% | 0.47% |
| Ophie C Beltran | P&F | 2700 | 100.00% | 0.58% |
| Timothy R Erich | Rfm | 3684 | 100.00% | 0.79% |
| Votes not Cast in Race | NA | 27890 | NA | 5.63% |
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