| Candidate | Party | County total | Percent, party | Percent, total |
| Diane Feinstein | Dem-Inc | 108655 | 97.3% | 62.7% |
| Michael Schmier | Dem | 3084 | 2.7% | 1.8% |
| Ray Haynes | Rep | 7476 | 13.5% | 4.4% |
| John M. Brown | Rep | 601 | 1.0% | 0.3% |
| Linh Dao | Rep | 870 | 1.5% | 0.5% |
| Tom Campbell | Rep | 44156 | 79.5% | 25.5% |
| Bill Horn | Rep | 1732 | 3.2% | 0.9% |
| James Peter Gough | Rep | 733 | 1.3% | 0.4% |
| Diane Beall Templin | AI | 490 | 100.0% | 0.2% |
| Jan B. Tucker | Grn | 723 | 27.8% | 0.4% |
| Medea Susan Benjamin | Grn | 1875 | 72.2% | 1.1% |
| Gail Katherine Lightfoot | Lib | 1917 | 100.0% | 1.2% |
| Brian M. Rees | NL | 400 | 100.0% | 0.2% |
| Jose Luis Camahort | Ref | 562 | 67.8% | 0.3% |
| Valli Sharpe-Geisler | Ref | 268 | 32.2% | 0.1% |
| Votes not Cast in Race | NA | 7648 | NA | 4.22% |
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Election: U.S. Senate
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