| Candidate | Party | County total | Percent, party | Percent, total |
| Diane Feinstein | Dem-Inc | 88902 | 96.8% | 60.2% |
| Michael Schmier | Dem | 2967 | 3.2% | 2.1% |
| Ray Haynes | Rep | 6759 | 14.7% | 4.6% |
| John M. Brown | Rep | 957 | 2.0% | 0.6% |
| Linh Dao | Rep | 694 | 1.5% | 0.4% |
| Tom Campbell | Rep | 31054 | 67.2% | 21.1% |
| Bill Horn | Rep | 5565 | 12.0% | 3.8% |
| James Peter Gough | Rep | 1223 | 2.6% | 0.8% |
| Diane Beall Templin | AI | 674 | 100.0% | 0.4% |
| Jan B. Tucker | Grn | 1302 | 28.3% | 0.8% |
| Medea Susan Benjamin | Grn | 3289 | 71.7% | 2.3% |
| Gail Katherine Lightfoot | Lib | 2872 | 100.0% | 2.0% |
| Brian M. Rees | NL | 590 | 100.0% | 0.3% |
| Jose Luis Camahort | Ref | 596 | 58.9% | 0.4% |
| Valli Sharpe-Geisler | Ref | 416 | 41.1% | 0.2% |
| Votes not Cast in Race | NA | 7449 | NA | 4.8% |
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Election: U.S. Senate
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