Voter Registration Totals as of August 1, 2019
| County |
Constitution |
Democratic |
Libertarian |
Republican |
Unaffiliated |
Total Registered |
| Ada |
657 |
46,950 |
3,037 |
104,442 |
97,194 |
252,280 |
| Adams |
16 |
186 |
14 |
1,696 |
682 |
2,594 |
| Bannock |
138 |
5,021 |
417 |
17,197 |
18,601 |
41,374 |
| Bear Lake |
17 |
120 |
14 |
2,639 |
635 |
3,425 |
| Benewah |
26 |
532 |
35 |
2,466 |
2,079 |
5,138 |
| Bingham |
79 |
1,693 |
91 |
12,543 |
5,704 |
20,110 |
| Blaine |
14 |
3,152 |
111 |
3,296 |
6,750 |
13,323 |
| Boise |
25 |
357 |
43 |
2,957 |
1,426 |
4,808 |
| Bonner |
153 |
2,733 |
255 |
15,057 |
8,161 |
26,359 |
| Bonneville |
186 |
4,186 |
438 |
29,843 |
17,938 |
52,591 |
| Boundary |
25 |
435 |
55 |
4,164 |
1,551 |
6,230 |
| Butte |
4 |
66 |
4 |
1,131 |
274 |
1,479 |
| Camas |
6 |
35 |
5 |
456 |
208 |
710 |
| Canyon |
395 |
10,312 |
896 |
46,848 |
32,392 |
90,843 |
| Caribou |
20 |
113 |
15 |
2,698 |
840 |
3,686 |
| Cassia |
31 |
508 |
43 |
6,729 |
2,092 |
9,403 |
| Clark |
2 |
15 |
2 |
312 |
53 |
384 |
| Clearwater |
13 |
354 |
29 |
2,255 |
1,708 |
4,359 |
| Custer |
4 |
150 |
19 |
1,971 |
648 |
2,792 |
| Elmore |
47 |
1,011 |
87 |
5,995 |
3,332 |
10,472 |
| Franklin |
46 |
174 |
28 |
4,568 |
1,306 |
6,122 |
| Fremont |
29 |
291 |
26 |
5,040 |
1,318 |
6,704 |
| Gem |
54 |
628 |
59 |
6,234 |
2,640 |
9,615 |
| Gooding |
21 |
554 |
34 |
3,766 |
1,745 |
6,120 |
| Idaho |
33 |
575 |
59 |
6,618 |
2,469 |
9,754 |
| Jefferson |
49 |
438 |
57 |
10,035 |
3,028 |
13,607 |
| Jerome |
86 |
730 |
50 |
4,428 |
2,642 |
7,936 |
| Kootenai |
365 |
8,977 |
770 |
44,550 |
27,592 |
82,254 |
| Latah |
76 |
4,689 |
313 |
7,564 |
9,927 |
22,569 |
| Lemhi |
13 |
388 |
36 |
3,368 |
1,394 |
5,199 |
| Lewis |
6 |
162 |
10 |
1,243 |
562 |
1,983 |
| Lincoln |
9 |
167 |
15 |
1,309 |
593 |
2,093 |
| Madison |
100 |
621 |
198 |
12,863 |
4,624 |
18,406 |
| Minidoka |
24 |
597 |
36 |
4,833 |
2,256 |
7,746 |
| Nez Perce |
72 |
2,601 |
133 |
8,724 |
9,713 |
21,243 |
| Oneida |
8 |
95 |
21 |
1,892 |
478 |
2,494 |
| Owyhee |
30 |
428 |
36 |
3,190 |
1,378 |
5,062 |
| Payette |
40 |
933 |
67 |
6,391 |
3,516 |
10,947 |
| Power |
8 |
384 |
11 |
1,693 |
1,189 |
3,285 |
| Shoshone |
21 |
1,324 |
30 |
2,494 |
2,622 |
6,491 |
| Teton |
14 |
1,285 |
61 |
2,413 |
2,458 |
6,231 |
| Twin Falls |
135 |
3,277 |
284 |
19,782 |
12,035 |
35,513 |
| Valley |
19 |
1,010 |
49 |
3,412 |
2,367 |
6,857 |
| Washington |
12 |
400 |
29 |
3,530 |
1,241 |
5,212 |
| Total |
3,128 |
108,657 |
8,022 |
434,635 |
301,361 |
855,803 |