| Candidate | Party | County total | Percent, party | Percent, total |
| Diane Feinstein | Dem-Inc | 35173 | 95.8% | 44.7% |
| Michael Schmier | Dem | 1572 | 4.2% | 2.0% |
| Ray Haynes | Rep | 9678 | 25.8% | 12.3% |
| John M. Brown | Rep | 526 | 1.4% | 0.7% |
| Linh Dao | Rep | 489 | 1.3% | 0.6% |
| Tom Campbell | Rep | 14717 | 39.3% | 18.7% |
| Bill Horn | Rep | 11534 | 30.8% | 14.7% |
| James Peter Gough | Rep | 540 | 1.4% | 0.7% |
| Diane Beall Templin | AI | 449 | 100.0% | 0.5% |
| Jan B. Tucker | Grn | 333 | 24.0% | 0.4% |
| Medea Susan Benjamin | Grn | 1053 | 76.0% | 1.4% |
| Gail Katherine Lightfoot | Lib | 1756 | 100.0% | 2.3% |
| Brian M. Rees | NL | 339 | 100.0% | 0.4% |
| Jose Luis Camahort | Ref | 366 | 63.0% | 0.4% |
| Valli Sharpe-Geisler | Ref | 215 | 37.0% | 0.2% |
| Votes not Cast in Race | NA | 5685 | NA | 6.73% |
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Election: U.S. Senate
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