| UNITED STATES SENATOR | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dem. | Dem. | Dem. - W/I | Rep. | Rep. | Rep. | Rep. | Rep. | Rep. | Rep. | Rep. | |
| Counties | David J. Archuleta | Larry LaRocco | Kevin Volkmann | Fred M. Adams | Brian E. Hefner | Bill Hunter | Richard Phenneger | Jim Risch | Hal James Styles Jr. | Scott A. Syme | Neal Thompson |
| Ada | 2,294 | 8,590 | 2 | 1,044 | 565 | 563 | 1,655 | 17,405 | 456 | 3,708 | 713 |
| Adams | 39 | 114 | 0 | 33 | 14 | 36 | 36 | 682 | 6 | 103 | 87 |
| Bannock | 1,468 | 2,279 | 0 | 83 | 34 | 95 | 132 | 1,865 | 28 | 296 | 120 |
| Bear Lake | 60 | 95 | 0 | 68 | 31 | 90 | 42 | 878 | 9 | 32 | 123 |
| Benewah | 120 | 384 | 0 | 26 | 9 | 27 | 31 | 375 | 15 | 14 | 22 |
| Bingham | 391 | 422 | 0 | 316 | 116 | 214 | 227 | 3,431 | 111 | 619 | 280 |
| Blaine | 277 | 1,010 | 0 | 18 | 18 | 19 | 17 | 500 | 6 | 93 | 21 |
| Boise | 68 | 156 | 0 | 64 | 50 | 54 | 69 | 983 | 19 | 87 | 53 |
| Bonner | 391 | 964 | 0 | 140 | 155 | 199 | 235 | 2,811 | 83 | 335 | 207 |
| Bonneville | 467 | 829 | 0 | 707 | 123 | 250 | 413 | 3,395 | 193 | 691 | 221 |
| Boundary | 99 | 308 | 1 | 43 | 69 | 71 | 68 | 804 | 21 | 116 | 76 |
| Butte | 42 | 46 | 0 | 39 | 21 | 36 | 22 | 563 | 17 | 30 | 30 |
| Camas | 18 | 21 | 0 | 4 | 10 | 14 | 11 | 206 | 5 | 11 | 9 |
| Canyon | 751 | 1,881 | 0 | 324 | 330 | 394 | 568 | 9,017 | 203 | 3,585 | 477 |
| Caribou | 61 | 59 | 0 | 85 | 56 | 76 | 56 | 1,337 | 31 | 66 | 138 |
| Cassia | 73 | 108 | 0 | 104 | 64 | 87 | 127 | 1,822 | 41 | 493 | 122 |
| Clark | 9 | 6 | 0 | 5 | 5 | 14 | 10 | 175 | 8 | 12 | 14 |
| Clearwater | 92 | 339 | 0 | 14 | 12 | 19 | 31 | 340 | 10 | 55 | 16 |
| Custer | 87 | 100 | 0 | 40 | 22 | 29 | 29 | 623 | 16 | 40 | 41 |
| Elmore | 145 | 394 | 0 | 42 | 36 | 44 | 90 | 1,147 | 32 | 184 | 67 |
| Franklin | 49 | 36 | 0 | 98 | 43 | 93 | 118 | 1,052 | 27 | 314 | 195 |
| Fremont | 74 | 95 | 0 | 106 | 48 | 128 | 76 | 2,036 | 56 | 262 | 182 |
| Gem | 119 | 269 | 0 | 73 | 71 | 96 | 94 | 1,796 | 57 | 376 | 91 |
| Gooding | 91 | 250 | 2 | 40 | 45 | 46 | 53 | 1,225 | 22 | 230 | 74 |
| Idaho | 137 | 564 | 0 | 100 | 58 | 76 | 46 | 1,723 | 29 | 244 | 95 |
| Jefferson | 61 | 144 | 0 | 122 | 44 | 72 | 116 | 962 | 36 | 220 | 76 |
| Jerome | 85 | 186 | 0 | 63 | 44 | 59 | 70 | 1,452 | 33 | 236 | 85 |
| Kootenai | 1,107 | 2,263 | 10 | 320 | 254 | 416 | 1,093 | 5,768 | 125 | 796 | 450 |
| Latah | 173 | 911 | 0 | 28 | 22 | 29 | 56 | 709 | 15 | 117 | 39 |
| Lemhi | 78 | 109 | 0 | 67 | 61 | 79 | 41 | 1,232 | 26 | 39 | 71 |
| Lewis | 47 | 200 | 0 | 24 | 14 | 14 | 12 | 426 | 2 | 19 | 22 |
| Lincoln | 47 | 98 | 0 | 35 | 22 | 36 | 29 | 507 | 7 | 40 | 36 |
| Madison | 57 | 101 | 0 | 146 | 58 | 235 | 129 | 2,633 | 69 | 315 | 202 |
| Minidoka | 87 | 179 | 0 | 69 | 49 | 55 | 109 | 1,088 | 41 | 328 | 92 |
| Nez Perce | 312 | 1,328 | 0 | 55 | 45 | 54 | 73 | 1,297 | 37 | 189 | 57 |
| Oneida | 41 | 28 | 0 | 76 | 39 | 99 | 36 | 714 | 12 | 79 | 102 |
| Owyhee | 73 | 123 | 0 | 51 | 39 | 57 | 56 | 1,078 | 27 | 320 | 38 |
| Payette | 128 | 328 | 0 | 34 | 25 | 24 | 43 | 1,004 | 13 | 265 | 37 |
| Power | 86 | 126 | 2 | 14 | 7 | 9 | 11 | 249 | 5 | 9 | 18 |
| Shoshone | 605 | 1,756 | 0 | 30 | 8 | 45 | 28 | 243 | 24 | 37 | 34 |
| Teton | 150 | 343 | 3 | 25 | 20 | 31 | 33 | 393 | 7 | 82 | 60 |
| Twin Falls | 299 | 860 | 0 | 139 | 104 | 129 | 257 | 3,006 | 74 | 762 | 146 |
| Valley | 87 | 274 | 0 | 52 | 33 | 52 | 54 | 1,057 | 19 | 114 | 302 |
| Washington | 129 | 347 | 0 | 21 | 22 | 15 | 30 | 734 | 9 | 697 | 34 |
| TOTAL | 11,074 | 29,023 | 20 | 4,987 | 2,915 | 4,280 | 6,532 | 80,743 | 2,082 | 16,660 | 5,375 |
| Plurality | 17,949 | 64,083 | |||||||||
| Percentage | 27.6% | 72.3% | 0.0% | 4.0% | 2.4% | 3.5% | 5.3% | 65.3% | 1.7% | 13.5% | 4.3% |