| Counties | Number Election Day Registrants | Total Number Registered Voters | Number Ballots Cast | % of Registered Voters That Voted |
|---|---|---|---|---|
| Ada | 4,053 | 150,311 | 51,287 | 34.1% |
| Adams | 35 | 2,291 | 1,103 | 48.1% |
| Bannock | 643 | 41,392 | 10,817 | 26.1% |
| Bear Lake | 91 | 3,285 | 1,815 | 55.3% |
| Benewah | 39 | 4,509 | 1,554 | 34.5% |
| Bingham | 360 | 18,353 | 6,815 | 37.1% |
| Blaine | 54 | 9,576 | 1,724 | 18.0% |
| Boise | 64 | 4,292 | 1,305 | 30.4% |
| Bonner | 347 | 18,624 | 5,751 | 30.9% |
| Bonneville | 660 | 39,365 | 10,754 | 27.3% |
| Boundary | 73 | 5,123 | 1,804 | 35.2% |
| Butte | 41 | 1,825 | 830 | 45.5% |
| Camas | 1 | 691 | 202 | 29.2% |
| Canyon | 741 | 56,478 | 17,426 | 30.9% |
| Caribou | 29 | 4,140 | 1,101 | 26.6% |
| Cassia | 219 | 9,172 | 3,948 | 43.0% |
| Clark | 13 | 443 | 325 | 73.4% |
| Clearwater | 100 | 4,916 | 2,171 | 44.2% |
| Custer | 45 | 2,709 | 1,202 | 44.4% |
| Elmore | 72 | 8,636 | 2,909 | 33.7% |
| Franklin | 187 | 5,098 | 2,750 | 53.9% |
| Fremont | 144 | 6,138 | 2,437 | 39.7% |
| Gem | 352 | 7,931 | 3,814 | 48.1% |
| Gooding | 81 | 6,320 | 2,195 | 34.7% |
| Idaho | 150 | 9,126 | 4,314 | 47.3% |
| Jefferson | 185 | 8,984 | 3,279 | 36.5% |
| Jerome | 53 | 8,088 | 1,753 | 21.7% |
| Kootenai | 864 | 53,774 | 15,447 | 28.7% |
| Latah | 123 | 19,603 | 3,430 | 17.5% |
| Lemhi | 32 | 4,488 | 1,861 | 41.5% |
| Lewis | 19 | 2,029 | 757 | 37.3% |
| Lincoln | 23 | 1,823 | 684 | 37.5% |
| Madison | 379 | 11,037 | 3,897 | 35.3% |
| Minidoka | 50 | 8,350 | 2,448 | 29.3% |
| Nez Perce | 178 | 19,742 | 4,791 | 24.3% |
| Oneida | 86 | 2,158 | 935 | 43.3% |
| Owyhee | 94 | 4,242 | 1,510 | 35.6% |
| Payette | 340 | 9,002 | 3,765 | 41.8% |
| Power | 37 | 3,410 | 1,019 | 29.9% |
| Shoshone | 85 | 7,713 | 2,435 | 31.6% |
| Teton | 90 | 3,541 | 1,563 | 44.1% |
| Twin Falls | 207 | 28,001 | 8,027 | 28.7% |
| Valley | 91 | 5,091 | 2,016 | 39.6% |
| Washington | 151 | 4,772 | 2,300 | 48.2% |
| TOTAL | 11,681 | 626,592 | 202,270 | 32.3% |
| 1st Cong Dist | 6,219 | 319,945 | 103,187 | 32.3% |
| 2nd Cong Dist | 5,462 | 306,647 | 99,083 | 32.3% |