| Idaho Secretary of State | 
| Counties | Total Number of Registered Voters at Cutoff | Number    Election Day Registrants | Total    Number Registered Voters | Number Ballots Cast | %    of Registered Voters That Voted | 
| Ada | 194,758 | 38,279 | 233,037 | 181,656 | 77.95% | 
| Adams | 2,703 | 239 | 2,942 | 2,387 | 81.14% | 
| Bannock | 40,110 | 8,204 | 48,314 | 35,627 | 73.74% | 
| Bear Lake | 3,463 | 395 | 3,858 | 3,112 | 80.66% | 
| Benewah | 5,059 | 367 | 5,426 | 4,305 | 79.34% | 
| Bingham | 19,671 | 3,639 | 23,310 | 17,519 | 75.16% | 
| Blaine | 12,416 | 1,572 | 13,988 | 10,707 | 76.54% | 
| Boise | 4,704 | 441 | 5,145 | 3,840 | 74.64% | 
| Bonner | 23,569 | 2,253 | 25,822 | 20,042 | 77.62% | 
| Bonneville | 45,501 | 9,683 | 55,184 | 42,376 | 76.79% | 
| Boundary | 6,008 | 438 | 6,446 | 4,847 | 75.19% | 
| Butte | 1,716 | 155 | 1,871 | 1,446 | 77.28% | 
| Camas | 762 | 75 | 837 | 628 | 75.03% | 
| Canyon | 72,650 | 9,672 | 82,322 | 65,359 | 79.39% | 
| Caribou | 4,150 | 312 | 4,462 | 3,404 | 76.29% | 
| Cassia | 9,001 | 1,384 | 10,385 | 7,979 | 76.83% | 
| Clark | 417 | 31 | 448 | 390 | 87.05% | 
| Clearwater | 4,686 | 415 | 5,101 | 4,012 | 78.65% | 
| Custer | 2,745 | 239 | 2,984 | 2,419 | 81.07% | 
| Elmore | 10,180 | 1,701 | 11,881 | 8,583 | 72.24% | 
| Franklin | 6,145 | 608 | 6,753 | 5,245 | 77.67% | 
| Fremont | 6,766 | 787 | 7,553 | 6,015 | 79.64% | 
| Gem | 9,107 | 987 | 10,094 | 8,118 | 80.42% | 
| Gooding | 6,039 | 779 | 6,818 | 5,537 | 81.21% | 
| Idaho | 10,197 | 617 | 10,814 | 8,519 | 78.78% | 
| Jefferson | 11,333 | 1,540 | 12,873 | 10,630 | 82.58% | 
| Jerome | 9,145 | 953 | 10,098 | 7,055 | 69.87% | 
| Kootenai | 70,426 | 8,802 | 79,228 | 63,034 | 79.56% | 
| Latah | 22,660 | 3,513 | 26,173 | 18,071 | 69.04% | 
| Lemhi | 5,040 | 372 | 5,412 | 4,186 | 77.35% | 
| Lewis | 2,098 | 215 | 2,313 | 1,856 | 80.24% | 
| Lincoln | 2,163 | 308 | 2,471 | 1,899 | 76.85% | 
| Madison | 14,334 | 4,130 | 18,464 | 13,330 | 72.19% | 
| Minidoka | 8,456 | 953 | 9,409 | 7,118 | 75.65% | 
| Nez Perce | 21,957 | 2,325 | 24,282 | 18,344 | 75.55% | 
| Oneida | 2,632 | 209 | 2,841 | 2,217 | 78.04% | 
| Owyhee | 4,550 | 730 | 5,280 | 4,187 | 79.30% | 
| Payette | 9,792 | 1,542 | 11,334 | 8,775 | 77.42% | 
| Power | 3,357 | 357 | 3,714 | 2,900 | 78.08% | 
| Shoshone | 6,364 | 802 | 7,166 | 5,908 | 82.44% | 
| Teton | 5,380 | 695 | 6,075 | 4,717 | 77.65% | 
| Twin Falls | 33,215 | 4,465 | 37,680 | 29,225 | 77.56% | 
| Valley | 6,354 | 695 | 7,049 | 5,360 | 76.04% | 
| Washington | 5,104 | 777 | 5,881 | 4,615 | 78.47% | 
| TOTAL | 746,883 | 116,655 | 863,538 | 667,499 | 77.30% | 
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