Voter Registration Totals as of December 4, 2018
| Cong. Dist. |
Total Registered |
| 1 |
453,613 |
| 2 |
414,227 |
| Total |
867,840 |
| Leg. Dist. |
Total Registered |
| 1 |
29,326 |
| 2 |
30,187 |
| 3 |
26,473 |
| 4 |
27,855 |
| 5 |
28,212 |
| 6 |
24,413 |
| 7 |
24,757 |
| 8 |
29,582 |
| 9 |
23,510 |
| 10 |
18,364 |
| 11 |
24,278 |
| 12 |
20,419 |
| 13 |
22,416 |
| 14 |
35,928 |
| 15 |
24,263 |
| 16 |
27,438 |
| 17 |
24,742 |
| 18 |
30,079 |
| 19 |
32,221 |
| 20 |
26,348 |
| 21 |
28,889 |
| 22 |
22,702 |
| 23 |
18,805 |
| 24 |
20,977 |
| 25 |
20,663 |
| 26 |
23,174 |
| 27 |
17,611 |
| 28 |
24,720 |
| 29 |
22,223 |
| 30 |
25,198 |
| 31 |
19,827 |
| 32 |
25,278 |
| 33 |
20,997 |
| 34 |
23,128 |
| 35 |
22,837 |
| Total |
867,840 |
| County |
Total Registered |
| Ada |
252,610 |
| Adams |
2,690 |
| Bannock |
43,480 |
| Bear Lake |
3,373 |
| Benewah |
5,219 |
| Bingham |
19,827 |
| Blaine |
13,823 |
| Boise |
4,967 |
| Bonner |
26,518 |
| Bonneville |
53,446 |
| Boundary |
6,411 |
| Butte |
1,528 |
| Camas |
721 |
| Canyon |
89,680 |
| Caribou |
3,675 |
| Cassia |
9,682 |
| Clark |
379 |
| Clearwater |
4,567 |
| Custer |
2,905 |
| Elmore |
10,674 |
| Franklin |
6,208 |
| Fremont |
6,868 |
| Gem |
10,060 |
| Gooding |
6,441 |
| Idaho |
9,975 |
| Jefferson |
14,062 |
| Jerome |
7,989 |
| Kootenai |
84,515 |
| Latah |
22,993 |
| Lemhi |
5,007 |
| Lewis |
2,122 |
| Lincoln |
2,189 |
| Madison |
18,791 |
| Minidoka |
7,929 |
| Nez Perce |
22,291 |
| Oneida |
2,534 |
| Owyhee |
5,211 |
| Payette |
11,172 |
| Power |
3,463 |
| Shoshone |
6,612 |
| Teton |
6,574 |
| Twin Falls |
36,571 |
| Valley |
6,643 |
| Washington |
5,445 |
| Total |
867,840 |