| Number Election Day Registrants | Total Number Registered Voters | Number Ballots Cast | % of Registered Voters That Voted | |
|---|---|---|---|---|
| Ada | 38,755 | 208,168 | 157,689 | 75.75% |
| Adams | 275 | 2,679 | 2,283 | 85.22% |
| Bannock | 9,135 | 48,877 | 35,716 | 73.07% |
| Bear Lake | 333 | 3,759 | 3,148 | 83.75% |
| Benewah | 374 | 5,126 | 4,192 | 81.78% |
| Bingham | 3,544 | 22,793 | 17,010 | 74.63% |
| Blaine | 906 | 12,612 | 10,290 | 81.59% |
| Boise | 475 | 4,998 | 3,620 | 72.43% |
| Bonner | 2,579 | 23,248 | 18,064 | 77.70% |
| Bonneville | 9,136 | 50,272 | 39,822 | 79.21% |
| Boundary | 321 | 6,167 | 4,462 | 72.35% |
| Butte | 209 | 1,991 | 1,451 | 72.88% |
| Camas | 84 | 858 | 614 | 71.56% |
| Canyon | 10,317 | 73,134 | 56,868 | 77.76% |
| Caribou | 442 | 4,537 | 3,409 | 75.14% |
| Cassia | 1,395 | 10,238 | 8,015 | 78.29% |
| Clark | 17 | 432 | 369 | 85.42% |
| Clearwater | 443 | 5,495 | 4,143 | 75.40% |
| Custer | 233 | 3,096 | 2,490 | 80.43% |
| Elmore | 1,719 | 11,127 | 8,230 | 73.96% |
| Franklin | 655 | 6,363 | 5,225 | 82.12% |
| Fremont | 985 | 7,471 | 5,945 | 79.57% |
| Gem | 1,302 | 9,776 | 7,345 | 75.13% |
| Gooding | 712 | 7,219 | 5,503 | 76.23% |
| Idaho | 782 | 10,407 | 8,176 | 78.56% |
| Jefferson | 1,803 | 11,317 | 9,362 | 82.73% |
| Jerome | 1,072 | 8,786 | 6,889 | 78.41% |
| Kootenai | 8,326 | 72,471 | 55,704 | 76.86% |
| Latah | 3,554 | 24,974 | 17,894 | 71.65% |
| Lemhi | 389 | 5,105 | 4,129 | 80.88% |
| Lewis | 217 | 2,504 | 1,892 | 75.56% |
| Lincoln | 324 | 2,294 | 1,927 | 84.00% |
| Madison | 3,433 | 16,081 | 11,805 | 73.41% |
| Minidoka | 1,033 | 9,515 | 7,463 | 78.43% |
| Nez Perce | 2,451 | 23,805 | 18,290 | 76.83% |
| Oneida | 377 | 2,645 | 2,155 | 81.47% |
| Owyhee | 649 | 4,955 | 3,719 | 75.06% |
| Payette | 1,566 | 9,480 | 8,339 | 87.96% |
| Power | 456 | 3,964 | 2,990 | 75.43% |
| Shoshone | 666 | 7,363 | 5,611 | 76.21% |
| Teton | 465 | 4,446 | 3,749 | 84.32% |
| Twin Falls | 4,398 | 35,488 | 27,437 | 77.31% |
| Valley | 593 | 6,254 | 4,875 | 77.95% |
| Washington | 722 | 5,725 | 4,477 | 78.20% |
| TOTAL | 117,622 | 798,015 | 612,786 | 76.79% |