Voter Registration Totals as of November 1, 2018
| Cong. Dist. |
Total Registered |
| 1 |
445,970 |
| 2 |
400,463 |
| Total |
846,433 |
| Leg. Dist. |
Total Registered |
| 1 |
28,537 |
| 2 |
29,195 |
| 3 |
25,331 |
| 4 |
26,956 |
| 5 |
27,812 |
| 6 |
23,543 |
| 7 |
24,217 |
| 8 |
28,627 |
| 9 |
22,714 |
| 10 |
18,299 |
| 11 |
24,495 |
| 12 |
20,599 |
| 13 |
22,185 |
| 14 |
36,257 |
| 15 |
24,024 |
| 16 |
25,696 |
| 17 |
22,725 |
| 18 |
29,233 |
| 19 |
31,712 |
| 20 |
26,428 |
| 21 |
29,136 |
| 22 |
22,210 |
| 23 |
18,134 |
| 24 |
20,266 |
| 25 |
20,234 |
| 26 |
22,323 |
| 27 |
17,086 |
| 28 |
23,635 |
| 29 |
21,121 |
| 30 |
24,814 |
| 31 |
19,487 |
| 32 |
24,811 |
| 33 |
19,863 |
| 34 |
22,691 |
| 35 |
22,037 |
| Total |
846,433 |
| County |
Total Registered |
| Ada |
247,421 |
| Adams |
2,590 |
| Bannock |
41,456 |
| Bear Lake |
3,331 |
| Benewah |
5,161 |
| Bingham |
19,487 |
| Blaine |
13,328 |
| Boise |
4,688 |
| Bonner |
25,815 |
| Bonneville |
51,910 |
| Boundary |
6,235 |
| Butte |
1,489 |
| Camas |
697 |
| Canyon |
89,515 |
| Caribou |
3,645 |
| Cassia |
9,367 |
| Clark |
383 |
| Clearwater |
4,439 |
| Custer |
2,836 |
| Elmore |
10,395 |
| Franklin |
6,150 |
| Fremont |
6,686 |
| Gem |
9,588 |
| Gooding |
6,192 |
| Idaho |
9,752 |
| Jefferson |
13,479 |
| Jerome |
8,042 |
| Kootenai |
81,482 |
| Latah |
22,651 |
| Lemhi |
4,873 |
| Lewis |
2,030 |
| Lincoln |
2,106 |
| Madison |
18,401 |
| Minidoka |
7,719 |
| Nez Perce |
21,513 |
| Oneida |
2,465 |
| Owyhee |
4,928 |
| Payette |
10,999 |
| Power |
3,300 |
| Shoshone |
6,513 |
| Teton |
6,277 |
| Twin Falls |
35,269 |
| Valley |
6,642 |
| Washington |
5,188 |
| Total |
846,433 |