| Candidate | Party | County total | Percent, party | Percent, total |
| Diane Feinstein | Dem-Inc | 23159 | 91.9% | 36.6% |
| Michael Schmier | Dem | 2060 | 8.1% | 3.3% |
| Ray Haynes | Rep | 6126 | 17.2% | 9.7% |
| John M. Brown | Rep | 626 | 1.7% | 1.0% |
| Linh Dao | Rep | 228 | 0.6% | 0.3% |
| Tom Campbell | Rep | 20787 | 58.3% | 32.9% |
| Bill Horn | Rep | 7547 | 21.2% | 12.0% |
| James Peter Gough | Rep | 372 | 1.0% | 0.5% |
| Diane Beall Templin | AI | 329 | 100.0% | 0.5% |
| Jan B. Tucker | Grn | 189 | 41.9% | 0.2% |
| Medea Susan Benjamin | Grn | 262 | 58.1% | 0.4% |
| Gail Katherine Lightfoot | Lib | 922 | 100.0% | 1.5% |
| Brian M. Rees | NL | 164 | 100.0% | 0.2% |
| Jose Luis Camahort | Ref | 472 | 80.3% | 0.8% |
| Valli Sharpe-Geisler | Ref | 116 | 19.7% | 0.1% |
| Votes not Cast in Race | NA | 3710 | NA | 5.53% |
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Election: U.S. Senate
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