| Candidate | Party | County total | Percent, party | Percent, total |
| Barbara Boxer | Dem-Inc | 4280 | 86.82% | 31.53% |
| John Pinkerton | Dem | 650 | 13.18% | 4.79% |
| John M Brown | Rep | 125 | 1.55% | 0.92% |
| Linh Dao | Rep | 58 | 0.72% | 0.43% |
| Matt Fong | Rep | 3523 | 43.82% | 25.95% |
| Darrell Issa | Rep | 3244 | 40.35% | 23.90% |
| Mark Raus | Rep | 213 | 2.65% | 1.57% |
| Frank D Riggs | Rep | 876 | 10.90% | 6.45% |
| H Joseph Perrin, Sr | AI | 69 | 100.00% | 0.51% |
| Ted Brown | Lib | 281 | 100.00% | 2.07% |
| Brian M Rees | NL | 58 | 100.00% | 0.43% |
| Ophie C Beltran | P&F | 80 | 100.00% | 0.59% |
| Timothy R Erich | Rfm | 119 | 100.00% | 0.88% |
| Votes not Cast in Race | NA | 479 | NA | 3.41% |
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