| Candidate | Party | County total | Percent, party | Percent, total |
| Diane Feinstein | Dem-Inc | 42805 | 96.5% | 54.3% |
| Michael Schmier | Dem | 1563 | 3.5% | 2.0% |
| Ray Haynes | Rep | 3371 | 11.0% | 4.3% |
| John M. Brown | Rep | 1112 | 3.6% | 1.5% |
| Linh Dao | Rep | 333 | 1.0% | 0.4% |
| Tom Campbell | Rep | 22074 | 71.6% | 28.0% |
| Bill Horn | Rep | 3546 | 11.5% | 4.5% |
| James Peter Gough | Rep | 402 | 1.3% | 0.5% |
| Diane Beall Templin | AI | 413 | 100.0% | 0.5% |
| Jan B. Tucker | Grn | 434 | 33.2% | 0.5% |
| Medea Susan Benjamin | Grn | 870 | 66.8% | 1.1% |
| Gail Katherine Lightfoot | Lib | 1058 | 100.0% | 1.4% |
| Brian M. Rees | NL | 278 | 100.0% | 0.3% |
| Jose Luis Camahort | Ref | 516 | 78.1% | 0.6% |
| Valli Sharpe-Geisler | Ref | 145 | 21.9% | 0.1% |
| Votes not Cast in Race | NA | 4373 | NA | 5.25% |
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Election: U.S. Senate
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