| Counties | Number Election Day Registrants | Total Number Registered Voters | Number Ballots Cast | % of Registered Voters That Voted |
|---|---|---|---|---|
| Ada | 16,507 | 170,696 | 106,774 | 62.6% |
| Adams | 78 | 2,389 | 1,625 | 68.0% |
| Bannock | 4,080 | 44,080 | 25,192 | 57.2% |
| Bear Lake | 161 | 3,449 | 2,467 | 71.5% |
| Benewah | 191 | 4,746 | 3,352 | 70.6% |
| Bingham | 1,382 | 19,579 | 12,404 | 63.4% |
| Blaine | 585 | 10,244 | 6,344 | 61.9% |
| Boise | 313 | 4,357 | 2,707 | 62.1% |
| Bonner | 1,230 | 19,769 | 11,145 | 56.4% |
| Bonneville | 4,351 | 43,255 | 28,695 | 66.3% |
| Boundary | 196 | 5,270 | 2,891 | 54.9% |
| Butte | 84 | 2,021 | 1,336 | 66.1% |
| Camas | 28 | 724 | 416 | 57.5% |
| Canyon | 3,888 | 60,831 | 37,521 | 61.7% |
| Caribou | 159 | 4,250 | 2,590 | 60.9% |
| Cassia | 526 | 9,671 | 6,055 | 62.6% |
| Clark | 7 | 427 | 308 | 72.1% |
| Clearwater | 168 | 5,120 | 3,191 | 62.3% |
| Custer | 154 | 2,855 | 1,808 | 63.3% |
| Elmore | 562 | 9,196 | 5,368 | 58.4% |
| Franklin | 182 | 5,349 | 3,304 | 61.8% |
| Fremont | 342 | 6,466 | 3,995 | 61.8% |
| Gem | 560 | 8,354 | 5,392 | 64.5% |
| Gooding | 255 | 6,557 | 4,164 | 63.5% |
| Idaho | 388 | 9,553 | 6,638 | 69.5% |
| Jefferson | 735 | 9,775 | 6,723 | 68.8% |
| Jerome | 293 | 8,403 | 4,627 | 55.1% |
| Kootenai | 2,839 | 58,182 | 32,469 | 55.8% |
| Latah | 1,883 | 22,004 | 11,867 | 53.9% |
| Lemhi | 226 | 4,835 | 3,563 | 73.7% |
| Lewis | 111 | 2,190 | 1,425 | 65.1% |
| Lincoln | 124 | 1,882 | 1,359 | 72.2% |
| Madison | 1,436 | 12,230 | 7,246 | 59.2% |
| Minidoka | 275 | 8,693 | 5,392 | 62.0% |
| Nez Perce | 1,140 | 20,944 | 12,752 | 60.9% |
| Oneida | 86 | 2,223 | 1,319 | 59.3% |
| Owyhee | 246 | 4,363 | 2,666 | 61.1% |
| Payette | 552 | 9,399 | 5,655 | 60.2% |
| Power | 157 | 3,586 | 2,306 | 64.3% |
| Shoshone | 179 | 7,838 | 4,366 | 55.7% |
| Teton | 176 | 3,890 | 2,367 | 60.8% |
| Twin Falls | 1,265 | 29,605 | 18,132 | 61.2% |
| Valley | 185 | 5,298 | 3,367 | 63.6% |
| Washington | 214 | 4,987 | 3,250 | 65.2% |
| TOTAL | 48,499 | 679,535 | 416,533 | 61.3% |