| Candidate | Party | County total | Percent, party | Percent, total |
| Diane Feinstein | Dem-Inc | 9025 | 94.0% | 53.1% |
| Michael Schmier | Dem | 581 | 6.0% | 3.5% |
| Ray Haynes | Rep | 1052 | 16.2% | 6.2% |
| John M. Brown | Rep | 223 | 3.5% | 1.4% |
| Linh Dao | Rep | 71 | 1.0% | 0.4% |
| Tom Campbell | Rep | 4109 | 63.1% | 24.2% |
| Bill Horn | Rep | 962 | 14.8% | 5.7% |
| James Peter Gough | Rep | 95 | 1.4% | 0.5% |
| Diane Beall Templin | AI | 95 | 100.0% | 0.5% |
| Jan B. Tucker | Grn | 91 | 34.8% | 0.5% |
| Medea Susan Benjamin | Grn | 170 | 65.2% | 1.0% |
| Gail Katherine Lightfoot | Lib | 325 | 100.0% | 2.0% |
| Brian M. Rees | NL | 53 | 100.0% | 0.3% |
| Jose Luis Camahort | Ref | 82 | 55.5% | 0.4% |
| Valli Sharpe-Geisler | Ref | 66 | 44.5% | 0.3% |
| Votes not Cast in Race | NA | 734 | NA | 4.14% |
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Election: U.S. Senate
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