Voter Registration Totals as of February 1, 2019
| Cong. Dist. |
Total Registered |
| 1 |
458,430 |
| 2 |
410,108 |
| Total |
868,538 |
| Leg. Dist. |
Total Registered |
| 1 |
29,330 |
| 2 |
29,298 |
| 3 |
25,696 |
| 4 |
26,800 |
| 5 |
27,688 |
| 6 |
23,270 |
| 7 |
24,203 |
| 8 |
29,126 |
| 9 |
23,562 |
| 10 |
19,433 |
| 11 |
25,510 |
| 12 |
21,702 |
| 13 |
23,448 |
| 14 |
37,725 |
| 15 |
24,890 |
| 16 |
26,929 |
| 17 |
24,232 |
| 18 |
30,719 |
| 19 |
33,028 |
| 20 |
27,581 |
| 21 |
30,567 |
| 22 |
23,490 |
| 23 |
18,457 |
| 24 |
20,502 |
| 25 |
20,190 |
| 26 |
23,000 |
| 27 |
17,054 |
| 28 |
23,523 |
| 29 |
20,879 |
| 30 |
25,356 |
| 31 |
20,298 |
| 32 |
25,191 |
| 33 |
20,263 |
| 34 |
23,415 |
| 35 |
22,183 |
| Total |
868,538 |
| County |
Total Registered |
| Ada |
259,161 |
| Adams |
2,671 |
| Bannock |
41,135 |
| Bear Lake |
3,372 |
| Benewah |
5,039 |
| Bingham |
20,298 |
| Blaine |
13,776 |
| Boise |
4,767 |
| Bonner |
26,776 |
| Bonneville |
52,977 |
| Boundary |
6,189 |
| Butte |
1,494 |
| Camas |
718 |
| Canyon |
94,241 |
| Caribou |
3,704 |
| Cassia |
9,367 |
| Clark |
374 |
| Clearwater |
4,454 |
| Custer |
2,887 |
| Elmore |
10,509 |
| Franklin |
6,374 |
| Fremont |
6,727 |
| Gem |
9,551 |
| Gooding |
6,400 |
| Idaho |
9,687 |
| Jefferson |
13,588 |
| Jerome |
7,927 |
| Kootenai |
81,794 |
| Latah |
22,649 |
| Lemhi |
4,969 |
| Lewis |
1,967 |
| Lincoln |
2,106 |
| Madison |
19,045 |
| Minidoka |
7,687 |
| Nez Perce |
21,303 |
| Oneida |
2,521 |
| Owyhee |
5,142 |
| Payette |
11,512 |
| Power |
3,267 |
| Shoshone |
6,427 |
| Teton |
6,232 |
| Twin Falls |
35,571 |
| Valley |
6,952 |
| Washington |
5,231 |
| Total |
868,538 |