| Counties | Number Election Day Registrants | Total Number Registered Voters | Number Ballots Cast | % of Registered Voters That Voted |
|---|---|---|---|---|
| Ada | 1,812 | 159,929 | 25,014 | 15.64% |
| Adams | 29 | 2,317 | 709 | 30.60% |
| Bannock | 325 | 38,498 | 6,221 | 16.16% |
| Bear Lake | 190 | 3,492 | 2,315 | 66.29% |
| Benewah | 66 | 4,565 | 1,591 | 34.85% |
| Bingham | 613 | 19,043 | 6,811 | 35.77% |
| Blaine | 285 | 10,366 | 3,562 | 34.36% |
| Boise | 46 | 4,243 | 898 | 21.16% |
| Bonner | 345 | 18,849 | 5,409 | 28.70% |
| Bonneville | 458 | 38,961 | 7,403 | 19.00% |
| Boundary | 61 | 5,699 | 2,486 | 43.62% |
| Butte | 14 | 1,744 | 335 | 19.21% |
| Camas | 12 | 767 | 258 | 33.64% |
| Canyon | 1,013 | 58,621 | 17,702 | 30.20% |
| Caribou | 44 | 4,042 | 889 | 21.99% |
| Cassia | 291 | 9,570 | 3,105 | 32.45% |
| Clark | 10 | 406 | 226 | 55.67% |
| Clearwater | 39 | 4,829 | 1,535 | 31.79% |
| Custer | 81 | 2,825 | 1,141 | 40.39% |
| Elmore | 121 | 8,677 | 2,650 | 30.54% |
| Franklin | 503 | 5,612 | 3,792 | 67.57% |
| Fremont | 420 | 6,490 | 3,408 | 52.51% |
| Gem | 304 | 8,042 | 3,405 | 42.34% |
| Gooding | 115 | 6,399 | 2,028 | 31.69% |
| Idaho | 277 | 9,271 | 4,838 | 52.18% |
| Jefferson | 150 | 9,269 | 2,451 | 26.44% |
| Jerome | 168 | 7,880 | 2,944 | 37.36% |
| Kootenai | 833 | 56,459 | 13,624 | 24.13% |
| Latah | 376 | 19,203 | 5,311 | 27.66% |
| Lemhi | 64 | 4,528 | 1,577 | 34.83% |
| Lewis | 42 | 2,235 | 948 | 42.42% |
| Lincoln | 179 | 1,992 | 1,007 | 50.55% |
| Madison | 296 | 11,809 | 5,154 | 43.64% |
| Minidoka | 98 | 8,162 | 2,427 | 29.74% |
| Nez Perce | 260 | 19,880 | 5,551 | 27.92% |
| Oneida | 61 | 2,138 | 827 | 38.68% |
| Owyhee | 114 | 4,140 | 1,497 | 36.16% |
| Payette | 424 | 9,144 | 3,540 | 38.71% |
| Power | 91 | 3,443 | 1,213 | 35.23% |
| Shoshone | 209 | 6,503 | 3,185 | 48.98% |
| Teton | 83 | 3,723 | 1,244 | 33.41% |
| Twin Falls | 324 | 28,149 | 8,001 | 28.42% |
| Valley | 157 | 5,324 | 2,186 | 41.06% |
| Washington | 107 | 4,773 | 1,588 | 33.27% |
| TOTAL | 11,510 | 642,011 | 172,006 | 26.79% |
| 1st Cong Dist | 5,870 | 332,531 | 89,661 | 26.96% |
| 2nd Cong Dist | 5,640 | 309,480 | 82,345 | 26.61% |