Voter Registration Totals as of October 3, 2019
| County |
Constitution |
Democratic |
Libertarian |
Republican |
Unaffiliated |
Total Registered |
| Ada |
676 |
47,827 |
3,109 |
105,437 |
98,541 |
255,590 |
| Adams |
16 |
188 |
14 |
1,703 |
688 |
2,609 |
| Bannock |
143 |
5,074 |
425 |
17,307 |
18,863 |
41,812 |
| Bear Lake |
17 |
124 |
15 |
2,636 |
635 |
3,427 |
| Benewah |
27 |
530 |
35 |
2,476 |
2,096 |
5,164 |
| Bingham |
82 |
1,715 |
92 |
12,553 |
5,749 |
20,191 |
| Blaine |
17 |
3,206 |
117 |
3,308 |
6,793 |
13,441 |
| Boise |
25 |
356 |
44 |
2,969 |
1,441 |
4,835 |
| Bonner |
156 |
2,780 |
260 |
15,148 |
8,254 |
26,598 |
| Bonneville |
194 |
4,263 |
437 |
29,955 |
18,195 |
53,044 |
| Boundary |
25 |
441 |
54 |
4,184 |
1,575 |
6,279 |
| Butte |
4 |
67 |
4 |
1,129 |
276 |
1,480 |
| Camas |
6 |
35 |
5 |
456 |
209 |
711 |
| Canyon |
405 |
10,483 |
928 |
47,233 |
32,723 |
91,772 |
| Caribou |
21 |
113 |
16 |
2,667 |
832 |
3,649 |
| Cassia |
33 |
521 |
46 |
6,741 |
2,121 |
9,462 |
| Clark |
2 |
15 |
2 |
313 |
54 |
386 |
| Clearwater |
14 |
361 |
31 |
2,266 |
1,713 |
4,385 |
| Custer |
4 |
159 |
19 |
1,968 |
646 |
2,796 |
| Elmore |
46 |
1,033 |
89 |
6,066 |
3,395 |
10,629 |
| Franklin |
47 |
175 |
33 |
4,580 |
1,318 |
6,153 |
| Fremont |
29 |
289 |
25 |
5,042 |
1,325 |
6,710 |
| Gem |
55 |
630 |
64 |
6,266 |
2,652 |
9,667 |
| Gooding |
21 |
554 |
34 |
3,778 |
1,756 |
6,143 |
| Idaho |
33 |
577 |
59 |
6,637 |
2,483 |
9,789 |
| Jefferson |
50 |
446 |
60 |
10,056 |
3,052 |
13,664 |
| Jerome |
85 |
737 |
49 |
4,435 |
2,681 |
7,987 |
| Kootenai |
373 |
9,152 |
789 |
45,194 |
28,078 |
83,586 |
| Latah |
73 |
4,689 |
311 |
7,510 |
9,847 |
22,430 |
| Lemhi |
14 |
391 |
35 |
3,371 |
1,396 |
5,207 |
| Lewis |
6 |
163 |
10 |
1,246 |
570 |
1,995 |
| Lincoln |
10 |
175 |
16 |
1,313 |
607 |
2,121 |
| Madison |
102 |
641 |
202 |
12,923 |
4,663 |
18,531 |
| Minidoka |
26 |
607 |
37 |
4,843 |
2,284 |
7,797 |
| Nez Perce |
75 |
2,625 |
141 |
8,779 |
9,738 |
21,358 |
| Oneida |
9 |
103 |
24 |
1,927 |
543 |
2,606 |
| Owyhee |
31 |
427 |
38 |
3,190 |
1,391 |
5,077 |
| Payette |
42 |
936 |
68 |
6,426 |
3,533 |
11,005 |
| Power |
8 |
384 |
11 |
1,701 |
1,197 |
3,301 |
| Shoshone |
21 |
1,330 |
34 |
2,531 |
2,668 |
6,584 |
| Teton |
14 |
1,299 |
61 |
2,412 |
2,469 |
6,255 |
| Twin Falls |
145 |
3,336 |
309 |
19,929 |
12,245 |
35,964 |
| Valley |
20 |
1,022 |
49 |
3,426 |
2,385 |
6,902 |
| Washington |
12 |
402 |
30 |
3,546 |
1,258 |
5,248 |
| Total |
3,214 |
110,381 |
8,231 |
437,576 |
304,938 |
864,340 |