1998 United States Senate election in Indiana
The 1998 United States Senate election in Indiana was held November 3, 1998. Incumbent Republican U.S. Senator Dan Coats decided to retire instead of seeking a second full term. Democratic nominee, former Governor Evan Bayh won the open seat his father once held.Candidates
Democratic
Overall
Bayh won 88 of Indiana's counties compared to 4 for Helmke.
| County | Bayh | Votes | Helmke | Votes | Sink-Burris | Votes | Total |
| Adams | 60.5% | 6,407 | 37.8% | 4,011 | 1.7% | 185 | 10,603 |
| Allen | 53.5% | 41,037 | 44.5% | 34,183 | 2.0% | 1,496 | 76,716 |
| Bartholomew | 60.9% | 11,937 | 37.7% | 7,383 | 1.4% | 275 | 19,595 |
| Benton | 62.2% | 2,019 | 36.1% | 1,172 | 1.7% | 54 | 3,245 |
| Blackford | 67.4% | 2,916 | 31.2% | 1,348 | 1.4% | 60 | 4,324 |
| Boone | 48.7% | 6,267 | 49.6% | 6,377 | 1.7% | 215 | 12,859 |
| Brown | 64.6% | 3,670 | 33.5% | 1,903 | 1.9% | 107 | 5,680 |
| Carroll | 62.4% | 3,987 | 36.6% | 2,340 | 1.0% | 63 | 6,390 |
| Cass | 60.5% | 7,454 | 38.0% | 4,691 | 1.5% | 184 | 12,329 |
| Clark | 71.8% | 18,747 | 27.1% | 7,090 | 1.1% | 291 | 26,128 |
| Clay | 73.2% | 6,099 | 25.7% | 2,137 | 1.1% | 95 | 8,331 |
| Clinton | 58.5% | 4,859 | 40.1% | 3,332 | 1.4% | 113 | 8,304 |
| Crawford | 70.0% | 2,673 | 28.2% | 1,075 | 1.8% | 70 | 3,818 |
| Daviess | 62.8% | 5,056 | 36.3% | 2,918 | 0.9% | 75 | 8,049 |
| Dearborn | 57.1% | 6,650 | 40.4% | 4,704 | 2.5% | 286 | 11,640 |
| Decatur | 63.5% | 4,372 | 35.4% | 2,434 | 1.1% | 79 | 6,885 |
| DeKalb | 57.3% | 5,217 | 41.1% | 3,736 | 1.6% | 145 | 9,098 |
| Delaware | 67.4% | 23,142 | 31.3% | 10,758 | 1.3% | 458 | 34,358 |
| Dubois | 71.2% | 8,623 | 26.4% | 3,199 | 2.4% | 292 | 12,114 |
| Elkhart | 51.9% | 17,863 | 47.1% | 16,238 | 1.0% | 334 | 34,435 |
| Fayette | 71.9% | 5,717 | 26.9% | 2,137 | 1.2% | 99 | 7,953 |
| Floyd | 68.1% | 15,150 | 30.7% | 6,832 | 1.2% | 261 | 22,243 |
| Fountain | 65.4% | 4,143 | 33.5% | 2,125 | 1.1% | 70 | 6,338 |
| Franklin | 64.4% | 3,817 | 33.9% | 2,014 | 1.7% | 100 | 5,931 |
| Fulton | 66.9% | 4,751 | 31.6% | 2,248 | 1.5% | 107 | 7,106 |
| Gibson | 73.2% | 8,265 | 25.8% | 2,914 | 0.9% | 107 | 11,286 |
| Grant | 61.9% | 13,067 | 37.1% | 7,829 | 1.0% | 212 | 21,108 |
| Greene | 71.5% | 8,002 | 27.4% | 3,062 | 1.1% | 123 | 11,187 |
| Hamilton | 42.4% | 18,793 | 56.2% | 24,948 | 1.4% | 611 | 44,352 |
| Hancock | 54.8% | 9,135 | 43.7% | 7,303 | 1.5% | 244 | 16,682 |
| Harrison | 69.4% | 8,245 | 28.9% | 3,430 | 1.7% | 200 | 11,875 |
| Hendricks | 46.8% | 11,458 | 52.0% | 12,757 | 1.2% | 301 | 24,516 |
| Henry | 66.2% | 10,029 | 32.6% | 4,954 | 1.2% | 176 | 15,159 |
| Howard | 63.6% | 15,811 | 35.0% | 8,686 | 1.4% | 347 | 24,844 |
| Huntington | 52.8% | 5,412 | 45.8% | 4,692 | 1.4% | 144 | 10,248 |
| Jackson | 68.2% | 8,557 | 30.7% | 3,856 | 1.1% | 144 | 12,557 |
| Jasper | 56.2% | 3,764 | 42.5% | 2,850 | 1.3% | 90 | 6,704 |
| Jay | 64.3% | 4,202 | 34.2% | 2,240 | 1.5% | 96 | 6,538 |
| Jefferson | 64.9% | 6,134 | 25.9% | 2,450 | 9.2% | 865 | 9,449 |
| Jennings | 63.8% | 4,507 | 34.6% | 2,448 | 1.6% | 110 | 7,065 |
| Johnson | 55.0% | 15,965 | 43.5% | 12,637 | 1.5% | 422 | 29,024 |
| Knox | 74.5% | 9,101 | 24.6% | 3,003 | 0.9% | 108 | 12,212 |
| Kosciusko | 48.1% | 8,423 | 49.9% | 8,750 | 2.0% | 342 | 17,515 |
| LaGrange | 58.1% | 3,715 | 40.6% | 2,596 | 1.3% | 81 | 6,392 |
| Lake | 78.0% | 80,073 | 20.9% | 21,429 | 1.1% | 1,139 | 102,641 |
| LaPorte | 71.2% | 21,495 | 27.5% | 8,304 | 1.3% | 386 | 30,185 |
| Lawrence | 61.2% | 7,967 | 37.3% | 4,850 | 1.5% | 201 | 13,018 |
| Madison | 69.6% | 29,134 | 29.4% | 12,317 | 1.0% | 426 | 41,877 |
| Marion | 60.9% | 122,830 | 37.5% | 75,688 | 1.6% | 3,329 | 201,847 |
| Marshall | 59.6% | 6,504 | 39.5% | 4,310 | 0.9% | 97 | 10,911 |
| Martin | 69.7% | 2,624 | 29.1% | 1,099 | 1.2% | 44 | 3,767 |
| Miami | 57.6% | 5,689 | 40.4% | 3,993 | 2.0% | 195 | 9,877 |
| Monroe | 66.2% | 19,044 | 30.8% | 8,845 | 3.0% | 862 | 28,751 |
| Montgomery | 56.2% | 5,062 | 42.5% | 3,835 | 1.3% | 113 | 9,010 |
| Morgan | 55.1% | 9,056 | 43.3% | 7,109 | 1.6% | 271 | 16,436 |
| Newton | 65.5% | 2,654 | 32.2% | 1,306 | 2.3% | 94 | 4,054 |
| Noble | 58.8% | 6,014 | 39.5% | 4,046 | 1.7% | 171 | 10,231 |
| Ohio | 59.6% | 1,208 | 37.5% | 760 | 2.9% | 58 | 2,026 |
| Orange | 64.2% | 4,343 | 33.8% | 2,293 | 2.0% | 134 | 6,770 |
| Owen | 67.7% | 3,625 | 30.4% | 1,632 | 1.9% | 101 | 5,358 |
| Parke | 71.4% | 4,192 | 27.4% | 1,611 | 1.2% | 71 | 5,874 |
| Perry | 76.2% | 4,218 | 22.9% | 1,265 | 0.9% | 49 | 5,532 |
| Pike | 74.0% | 3,883 | 24.5% | 1,284 | 1.5% | 79 | 5,246 |
| Porter | 69.6% | 26,219 | 28.9% | 10,890 | 1.5% | 557 | 37,666 |
| Posey | 73.9% | 6,870 | 24.9% | 2,316 | 1.2% | 116 | 9,302 |
| Pulaski | 62.6% | 2,853 | 36.0% | 1,641 | 1.4% | 62 | 4,556 |
| Putnam | 61.5% | 5,706 | 37.0% | 3,437 | 1.5% | 138 | 9,281 |
| Randolph | 61.3% | 4,351 | 37.3% | 2,643 | 1.4% | 101 | 7,095 |
| Ripley | 61.2% | 5,105 | 37.7% | 3,149 | 1.1% | 96 | 8,350 |
| Rush | 64.0% | 4,051 | 34.5% | 2,184 | 1.5% | 92 | 6,327 |
| Saint Joseph | 68.3% | 47,214 | 30.7% | 21,229 | 1.0% | 667 | 69,110 |
| Scott | 75.2% | 4,492 | 23.9% | 1,428 | 0.9% | 55 | 5,975 |
| Shelby | 62.4% | 7,201 | 36.3% | 4,186 | 1.3% | 155 | 11,542 |
| Spencer | 69.0% | 5,121 | 30.4% | 2,253 | 0.6% | 48 | 7,422 |
| Starke | 71.7% | 5,127 | 26.4% | 1,892 | 1.9% | 135 | 7,154 |
| Steuben | 55.3% | 4,204 | 42.5% | 3,237 | 2.2% | 166 | 7,607 |
| Sullivan | 79.0% | 5,565 | 19.7% | 1,387 | 1.3% | 90 | 7,042 |
| Switzerland | 67.7% | 1,847 | 31.2% | 851 | 1.1% | 30 | 2,728 |
| Tippecanoe | 60.1% | 20,293 | 38.6% | 13,025 | 1.3% | 452 | 33,770 |
| Tipton | 62.3% | 3,517 | 36.3% | 2,051 | 1.4% | 78 | 5,646 |
| Union | 60.7% | 1,451 | 37.2% | 889 | 2.1% | 51 | 2,391 |
| Vanderburgh | 71.5% | 36,558 | 27.3% | 14,010 | 1.2% | 590 | 51,158 |
| Vermillion | 82.2% | 4,195 | 16.5% | 842 | 1.3% | 65 | 5,102 |
| Vigo | 76.6% | 22,070 | 22.2% | 6,415 | 1.2% | 337 | 28,822 |
| Wabash | 55.1% | 4,739 | 44.0% | 3,781 | 0.9% | 78 | 8,598 |
| Warren | 67.0% | 2,324 | 31.6% | 1,095 | 1.4% | 50 | 3,469 |
| Warrick | 70.8% | 11,889 | 28.0% | 4,700 | 1.2% | 194 | 16,783 |
| Washington | 65.7% | 5,282 | 28.5% | 2,289 | 5.9% | 472 | 8,043 |
| Wayne | 63.5% | 12,704 | 35.3% | 7,068 | 1.2% | 247 | 20,019 |
| Wells | 56.6% | 5,146 | 41.9% | 3,806 | 1.5% | 137 | 9,089 |
| White | 68.3% | 5,791 | 30.5% | 2,592 | 1.2% | 103 | 8,486 |
| Whitley | 58.9% | 5,586 | 38.8% | 3,680 | 2.3% | 222 | 9,488 |
