Voter Registration Totals as of July 3, 2019
| County |
Constitution |
Democratic |
Libertarian |
Republican |
Unaffiliated |
Total Registered |
| Ada |
656 |
46,918 |
3,032 |
104,505 |
97,120 |
252,231 |
| Adams |
16 |
186 |
14 |
1,700 |
688 |
2,604 |
| Bannock |
138 |
5,011 |
418 |
17,209 |
18,609 |
41,385 |
| Bear Lake |
17 |
119 |
14 |
2,650 |
639 |
3,439 |
| Benewah |
26 |
532 |
35 |
2,467 |
2,080 |
5,140 |
| Bingham |
78 |
1,688 |
90 |
12,503 |
5,641 |
20,000 |
| Blaine |
14 |
3,141 |
112 |
3,295 |
6,743 |
13,305 |
| Boise |
25 |
355 |
43 |
2,958 |
1,426 |
4,807 |
| Bonner |
151 |
2,734 |
252 |
15,066 |
8,165 |
26,368 |
| Bonneville |
187 |
4,181 |
441 |
29,962 |
18,008 |
52,779 |
| Boundary |
26 |
438 |
56 |
4,171 |
1,547 |
6,238 |
| Butte |
4 |
66 |
4 |
1,132 |
275 |
1,481 |
| Camas |
6 |
36 |
5 |
456 |
206 |
709 |
| Canyon |
395 |
10,306 |
893 |
46,818 |
32,362 |
90,774 |
| Caribou |
20 |
113 |
15 |
2,698 |
840 |
3,686 |
| Cassia |
31 |
509 |
43 |
6,740 |
2,096 |
9,419 |
| Clark |
2 |
18 |
2 |
319 |
55 |
396 |
| Clearwater |
13 |
356 |
29 |
2,260 |
1,721 |
4,379 |
| Custer |
4 |
152 |
19 |
1,977 |
649 |
2,801 |
| Elmore |
47 |
1,016 |
88 |
6,010 |
3,334 |
10,495 |
| Franklin |
47 |
174 |
30 |
4,570 |
1,306 |
6,127 |
| Fremont |
29 |
291 |
25 |
5,044 |
1,314 |
6,703 |
| Gem |
54 |
628 |
59 |
6,233 |
2,642 |
9,616 |
| Gooding |
21 |
553 |
34 |
3,761 |
1,741 |
6,110 |
| Idaho |
33 |
578 |
59 |
6,623 |
2,470 |
9,763 |
| Jefferson |
49 |
438 |
57 |
10,032 |
3,027 |
13,603 |
| Jerome |
86 |
734 |
50 |
4,446 |
2,650 |
7,966 |
| Kootenai |
362 |
8,973 |
768 |
44,553 |
27,574 |
82,230 |
| Latah |
74 |
4,694 |
313 |
7,567 |
9,920 |
22,568 |
| Lemhi |
13 |
388 |
34 |
3,373 |
1,394 |
5,202 |
| Lewis |
6 |
164 |
10 |
1,248 |
567 |
1,995 |
| Lincoln |
9 |
166 |
16 |
1,316 |
601 |
2,108 |
| Madison |
101 |
622 |
198 |
12,894 |
4,640 |
18,455 |
| Minidoka |
24 |
597 |
36 |
4,848 |
2,267 |
7,772 |
| Nez Perce |
74 |
2,606 |
133 |
8,734 |
9,713 |
21,260 |
| Oneida |
8 |
96 |
21 |
1,894 |
479 |
2,498 |
| Owyhee |
30 |
437 |
36 |
3,245 |
1,412 |
5,160 |
| Payette |
40 |
935 |
67 |
6,400 |
3,516 |
10,958 |
| Power |
8 |
384 |
11 |
1,693 |
1,189 |
3,285 |
| Shoshone |
21 |
1,329 |
31 |
2,493 |
2,619 |
6,493 |
| Teton |
14 |
1,286 |
61 |
2,413 |
2,456 |
6,230 |
| Twin Falls |
134 |
3,273 |
284 |
19,831 |
12,016 |
35,538 |
| Valley |
19 |
1,013 |
49 |
3,439 |
2,381 |
6,901 |
| Washington |
12 |
399 |
28 |
3,537 |
1,238 |
5,214 |
| Total |
3,124 |
108,633 |
8,015 |
435,083 |
301,336 |
856,191 |