| Candidate | Party | County total | Percent, party | Percent, total |
| Barbara Boxer | Dem-Inc | 25449 | 93.67% | 37.10% |
| John Pinkerton | Dem | 1721 | 6.33% | 2.51% |
| John M Brown | Rep | 617 | 1.58% | 0.90% |
| Linh Dao | Rep | 172 | 0.44% | 0.25% |
| Matt Fong | Rep | 16191 | 41.40% | 23.60% |
| Darrell Issa | Rep | 18149 | 46.41% | 26.46% |
| Mark Raus | Rep | 523 | 1.34% | 0.76% |
| Frank D Riggs | Rep | 3456 | 8.84% | 5.04% |
| H Joseph Perrin, Sr | AI | 267 | 100.00% | 0.39% |
| Ted Brown | Lib | 911 | 100.00% | 1.33% |
| Brian M Rees | NL | 290 | 100.00% | 0.42% |
| Ophie C Beltran | P&F | 357 | 100.00% | 0.52% |
| Timothy R Erich | Rfm | 500 | 100.00% | 0.73% |
| Votes not Cast in Race | NA | 2302 | NA | 3.25% |
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