| Candidate | Party | County total | Percent, party | Percent, total |
| Barbara Boxer | Dem-Inc | 34220 | 93.45% | 53.22% |
| John Pinkerton | Dem | 2400 | 6.55% | 3.73% |
| John M Brown | Rep | 335 | 1.40% | 0.52% |
| Linh Dao | Rep | 369 | 1.54% | 0.57% |
| Matt Fong | Rep | 11066 | 46.18% | 17.21% |
| Darrell Issa | Rep | 9407 | 39.25% | 14.63% |
| Mark Raus | Rep | 501 | 2.09% | 0.78% |
| Frank D Riggs | Rep | 2287 | 9.54% | 3.56% |
| H Joseph Perrin, Sr | AI | 282 | 100.00% | 0.44% |
| Ted Brown | Lib | 1382 | 100.00% | 2.15% |
| Brian M Rees | NL | 432 | 100.00% | 0.67% |
| Ophie C Beltran | P&F | 1102 | 100.00% | 1.71% |
| Timothy R Erich | Rfm | 513 | 100.00% | 0.80% |
| Votes not Cast in Race | NA | 2530 | NA | 3.79% |
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