June 1998 Primary Election, U.S. Senate: Madera County
| Candidate | Party | County total | Percent, party | Percent, total |
| Barbara Boxer | Dem-Inc | 5747 | 86.54% | 27.85% |
| John Pinkerton | Dem | 894 | 13.46% | 4.33% |
| John M Brown | Rep | 158 | 1.19% | 0.77% |
| Linh Dao | Rep | 80 | 0.60% | 0.39% |
| Matt Fong | Rep | 5086 | 38.34% | 24.65% |
| Darrell Issa | Rep | 6565 | 49.48% | 31.81% |
| Mark Raus | Rep | 160 | 1.21% | 0.78% |
| Frank D Riggs | Rep | 1218 | 9.18% | 5.90% |
| H Joseph Perrin, Sr | AI | 112 | 100.00% | 0.54% |
| Ted Brown | Lib | 225 | 100.00% | 1.09% |
| Brian M Rees | NL | 89 | 100.00% | 0.43% |
| Ophie C Beltran | P&F | 189 | 100.00% | 0.92% |
| Timothy R Erich | Rfm | 114 | 100.00% | 0.55% |
| Votes not Cast in Race | NA | 795 | NA | 3.71% |
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