| Candidate | Party | County total | Percent, party | Percent, total |
| Diane Feinstein | Dem-Inc | 71916 | 95.6% | 46.4% |
| Michael Schmier | Dem | 3367 | 4.4% | 2.2% |
| Ray Haynes | Rep | 9194 | 12.5% | 6.0% |
| John M. Brown | Rep | 1448 | 1.9% | 1.0% |
| Linh Dao | Rep | 712 | 0.9% | 0.4% |
| Tom Campbell | Rep | 49868 | 67.9% | 32.2% |
| Bill Horn | Rep | 11552 | 15.8% | 7.5% |
| James Peter Gough | Rep | 765 | 1.0% | 0.4% |
| Diane Beall Templin | AI | 654 | 100.0% | 0.4% |
| Jan B. Tucker | Grn | 616 | 37.1% | 0.3% |
| Medea Susan Benjamin | Grn | 1043 | 62.9% | 0.6% |
| Gail Katherine Lightfoot | Lib | 2187 | 100.0% | 1.5% |
| Brian M. Rees | NL | 456 | 100.0% | 0.2% |
| Jose Luis Camahort | Ref | 1169 | 80.2% | 0.8% |
| Valli Sharpe-Geisler | Ref | 289 | 19.8% | 0.1% |
| Votes not Cast in Race | NA | 9963 | NA | 6.03% |
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Election: U.S. Senate
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