| United States Senator | ||||
|---|---|---|---|---|
| CON | REP | WRITE IN | DEM | |
| Counties | Randy Lynn Bergquist | Mike Crapo | Frederick R. Reinisch Jr. | P. Tom Sullivan |
| Ada | 3,653 | 80,273 | 3 | 36,377 |
| Adams | 95 | 1,225 | 0 | 338 |
| Bannock | 844 | 14,636 | 23 | 7,988 |
| Bear Lake | 104 | 1,771 | 0 | 331 |
| Benewah | 185 | 2,140 | 0 | 673 |
| Bingham | 440 | 9,225 | 0 | 2,182 |
| Blaine | 117 | 3,246 | 0 | 3,213 |
| Boise | 146 | 2,022 | 1 | 580 |
| Bonner | 560 | 9,372 | 0 | 4,032 |
| Bonneville | 1,177 | 22,073 | 19 | 5,937 |
| Boundary | 237 | 2,495 | 0 | 775 |
| Butte | 58 | 872 | 0 | 209 |
| Camas | 33 | 343 | 0 | 74 |
| Canyon | 1,655 | 34,000 | 0 | 8,360 |
| Caribou | 112 | 1,819 | 0 | 323 |
| Cassia | 237 | 4,789 | 7 | 537 |
| Clark | 18 | 283 | 0 | 40 |
| Clearwater | 123 | 2,049 | 0 | 712 |
| Custer | 145 | 1,351 | 0 | 344 |
| Elmore | 220 | 4,094 | 0 | 1,061 |
| Franklin | 303 | 2,996 | 0 | 393 |
| Fremont | 143 | 3,348 | 0 | 530 |
| Gem | 245 | 4,326 | 5 | 909 |
| Gooding | 205 | 3,015 | 0 | 736 |
| Idaho | 431 | 4,933 | 0 | 1,162 |
| Jefferson | 401 | 6,230 | 0 | 880 |
| Jerome | 177 | 3,709 | 0 | 782 |
| Kootenai | 1,701 | 29,983 | 0 | 10,476 |
| Latah | 372 | 6,736 | 0 | 5,162 |
| Lemhi | 162 | 2,553 | 0 | 642 |
| Lewis | 63 | 963 | 0 | 271 |
| Lincoln | 62 | 956 | 0 | 236 |
| Madison | 325 | 6,616 | 15 | 734 |
| Minidoka | 211 | 3,846 | 0 | 708 |
| Nez Perce | 338 | 8,492 | 10 | 3,695 |
| Oneida | 74 | 1,329 | 0 | 213 |
| Owyhee | 142 | 2,319 | 0 | 397 |
| Payette | 322 | 4,684 | 0 | 1,001 |
| Power | 61 | 1,599 | 0 | 545 |
| Shoshone | 182 | 2,286 | 0 | 1,356 |
| Teton | 52 | 1,766 | 0 | 1,564 |
| Twin Falls | 809 | 14,181 | 2 | 3,761 |
| Valley | 118 | 2,453 | 6 | 1,227 |
| Washington | 371 | 2,556 | 0 | 591 |
| TOTAL | 17,429 | 319,953 | 91 | 112,057 |
| Plurality | 207,896 | |||
| Percentage | 3.9% | 71.2% | 0.0% | 24.9% |