| Candidate | Party | County total | Percent, party | Percent, total |
| Barbara Boxer | Dem-Inc | 3656 | 76.37% | 23.59% |
| John Pinkerton | Dem | 1131 | 23.63% | 7.30% |
| John M Brown | Rep | 177 | 1.77% | 1.14% |
| Linh Dao | Rep | 67 | 0.67% | 0.43% |
| Matt Fong | Rep | 4120 | 41.10% | 26.58% |
| Darrell Issa | Rep | 4514 | 45.03% | 29.12% |
| Mark Raus | Rep | 207 | 2.07% | 1.34% |
| Frank D Riggs | Rep | 939 | 9.37% | 6.06% |
| H Joseph Perrin, Sr | AI | 142 | 100.00% | 0.92% |
| Ted Brown | Lib | 245 | 100.00% | 1.58% |
| Brian M Rees | NL | 95 | 100.00% | 0.61% |
| Ophie C Beltran | P&F | 74 | 100.00% | 0.48% |
| Timothy R Erich | Rfm | 132 | 100.00% | 0.85% |
| Votes not Cast in Race | NA | 469 | NA | 2.94% |
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