| United States Senator | ||
|---|---|---|
| DEM | REP | |
| Counties | Nels Mitchell | Jim Risch |
| Ada | 59,423 | 69,404 |
| Adams | 375 | 1,022 |
| Bannock | 9,351 | 12,980 |
| Bear Lake | 289 | 1,599 |
| Benewah | 719 | 1,924 |
| Bingham | 2,578 | 8,013 |
| Blaine | 4,186 | 2,854 |
| Boise | 780 | 1,902 |
| Bonner | 4,219 | 8,462 |
| Bonneville | 7,564 | 19,240 |
| Boundary | 785 | 2,517 |
| Butte | 240 | 895 |
| Camas | 100 | 329 |
| Canyon | 12,244 | 32,063 |
| Caribou | 327 | 1,618 |
| Cassia | 824 | 4,616 |
| Clark | 37 | 195 |
| Clearwater | 761 | 1,876 |
| Custer | 420 | 1,361 |
| Elmore | 1,543 | 3,690 |
| Franklin | 312 | 2,527 |
| Fremont | 720 | 3,356 |
| Gem | 1,236 | 3,961 |
| Gooding | 1,021 | 2,912 |
| Idaho | 1,246 | 4,371 |
| Jefferson | 1,090 | 5,968 |
| Jerome | 1,080 | 3,294 |
| Kootenai | 11,263 | 25,681 |
| Latah | 5,813 | 5,826 |
| Lemhi | 654 | 2,273 |
| Lewis | 307 | 893 |
| Lincoln | 363 | 972 |
| Madison | 886 | 5,902 |
| Minidoka | 981 | 3,622 |
| Nez Perce | 4,186 | 6,974 |
| Oneida | 174 | 918 |
| Owyhee | 460 | 2,117 |
| Payette | 1,321 | 4,366 |
| Power | 635 | 1,441 |
| Shoshone | 1,407 | 1,874 |
| Teton | 1,909 | 1,991 |
| Twin Falls | 5,489 | 13,309 |
| Valley | 1,475 | 2,067 |
| Washington | 781 | 2,421 |
| TOTAL | 151,574 | 285,596 |
| Plurality | 134,022 | |
| Percentage | 34.7 % | 65.3 % |