Voter Registration Totals as of April 2, 2018
| Cong. Dist. |
Total Registered |
| 1 |
420,278 |
| 2 |
383,644 |
| Total |
803,922 |
| Leg. Dist. |
Total Registered |
| 01 |
27,042 |
| 02 |
27,733 |
| 03 |
23,511 |
| 04 |
24,988 |
| 05 |
26,674 |
| 06 |
22,757 |
| 07 |
23,406 |
| 08 |
27,310 |
| 09 |
21,785 |
| 10 |
17,115 |
| 11 |
23,081 |
| 12 |
19,356 |
| 13 |
20,924 |
| 14 |
33,081 |
| 15 |
22,599 |
| 16 |
24,115 |
| 17 |
21,200 |
| 18 |
27,336 |
| 19 |
29,627 |
| 20 |
24,598 |
| 21 |
27,232 |
| 22 |
20,801 |
| 23 |
17,409 |
| 24 |
19,514 |
| 25 |
19,638 |
| 26 |
21,312 |
| 27 |
16,835 |
| 28 |
22,792 |
| 29 |
20,298 |
| 30 |
24,034 |
| 31 |
18,979 |
| 32 |
24,177 |
| 33 |
19,377 |
| 34 |
22,100 |
| 35 |
21,186 |
| Total |
803,922 |
| County |
Total Registered |
| Ada |
230,589 |
| Adams |
2,460 |
| Bannock |
39,857 |
| Bear Lake |
3,254 |
| Benewah |
4,978 |
| Bingham |
18,979 |
| Blaine |
12,527 |
| Boise |
4,471 |
| Bonner |
24,397 |
| Bonneville |
50,528 |
| Boundary |
5,977 |
| Butte |
1,433 |
| Camas |
663 |
| Canyon |
84,266 |
| Caribou |
3,619 |
| Cassia |
9,190 |
| Clark |
363 |
| Clearwater |
4,300 |
| Custer |
2,736 |
| Elmore |
9,889 |
| Franklin |
6,078 |
| Fremont |
6,502 |
| Gem |
9,253 |
| Gooding |
6,024 |
| Idaho |
9,491 |
| Jefferson |
12,888 |
| Jerome |
7,763 |
| Kootenai |
76,232 |
| Latah |
21,696 |
| Lemhi |
4,734 |
| Lewis |
1,991 |
| Lincoln |
2,098 |
| Madison |
17,977 |
| Minidoka |
7,645 |
| Nez Perce |
20,766 |
| Oneida |
2,429 |
| Owyhee |
4,766 |
| Payette |
10,502 |
| Power |
3,233 |
| Shoshone |
6,283 |
| Teton |
5,960 |
| Twin Falls |
34,143 |
| Valley |
6,116 |
| Washington |
5,033 |
| Total |
804,079 |