Voter Registration Totals as of September 3, 2019
| County |
Constitution |
Democratic |
Libertarian |
Republican |
Unaffiliated |
Total Registered |
| Ada |
660 |
47,167 |
3,047 |
104,643 |
97,501 |
253,018 |
| Adams |
16 |
186 |
14 |
1,699 |
683 |
2,598 |
| Bannock |
140 |
5,043 |
419 |
17,232 |
18,714 |
41,548 |
| Bear Lake |
17 |
121 |
14 |
2,630 |
636 |
3,418 |
| Benewah |
27 |
529 |
35 |
2,468 |
2,084 |
5,143 |
| Bingham |
79 |
1,694 |
91 |
12,519 |
5,704 |
20,087 |
| Blaine |
15 |
3,165 |
112 |
3,295 |
6,754 |
13,341 |
| Boise |
25 |
357 |
43 |
2,967 |
1,433 |
4,825 |
| Bonner |
150 |
2,753 |
257 |
15,088 |
8,188 |
26,436 |
| Bonneville |
187 |
4,194 |
437 |
29,864 |
18,031 |
52,713 |
| Boundary |
25 |
437 |
55 |
4,165 |
1,555 |
6,237 |
| Butte |
4 |
67 |
4 |
1,133 |
276 |
1,484 |
| Camas |
6 |
36 |
5 |
456 |
209 |
712 |
| Canyon |
397 |
10,333 |
898 |
46,943 |
32,442 |
91,013 |
| Caribou |
20 |
113 |
15 |
2,696 |
838 |
3,682 |
| Cassia |
33 |
511 |
43 |
6,729 |
2,093 |
9,409 |
| Clark |
2 |
15 |
2 |
312 |
54 |
385 |
| Clearwater |
13 |
355 |
29 |
2,262 |
1,708 |
4,367 |
| Custer |
4 |
154 |
19 |
1,971 |
643 |
2,791 |
| Elmore |
47 |
1,015 |
86 |
6,003 |
3,342 |
10,493 |
| Franklin |
46 |
173 |
29 |
4,572 |
1,310 |
6,130 |
| Fremont |
29 |
290 |
26 |
5,038 |
1,324 |
6,707 |
| Gem |
54 |
627 |
59 |
6,242 |
2,642 |
9,624 |
| Gooding |
21 |
552 |
35 |
3,769 |
1,748 |
6,125 |
| Idaho |
33 |
577 |
59 |
6,635 |
2,475 |
9,779 |
| Jefferson |
50 |
442 |
57 |
10,023 |
3,025 |
13,597 |
| Jerome |
86 |
731 |
50 |
4,427 |
2,659 |
7,953 |
| Kootenai |
365 |
8,998 |
770 |
44,655 |
27,710 |
82,498 |
| Latah |
76 |
4,718 |
314 |
7,582 |
9,947 |
22,637 |
| Lemhi |
13 |
387 |
35 |
3,370 |
1,395 |
5,200 |
| Lewis |
6 |
162 |
10 |
1,243 |
565 |
1,986 |
| Lincoln |
10 |
172 |
15 |
1,313 |
607 |
2,117 |
| Madison |
100 |
625 |
197 |
12,887 |
4,631 |
18,440 |
| Minidoka |
25 |
598 |
36 |
4,835 |
2,265 |
7,759 |
| Nez Perce |
72 |
2,599 |
133 |
8,722 |
9,712 |
21,238 |
| Oneida |
8 |
97 |
21 |
1,908 |
499 |
2,533 |
| Owyhee |
29 |
428 |
36 |
3,185 |
1,381 |
5,059 |
| Payette |
40 |
937 |
68 |
6,402 |
3,516 |
10,963 |
| Power |
8 |
384 |
11 |
1,697 |
1,194 |
3,294 |
| Shoshone |
21 |
1,329 |
30 |
2,502 |
2,655 |
6,537 |
| Teton |
14 |
1,290 |
61 |
2,413 |
2,457 |
6,235 |
| Twin Falls |
138 |
3,293 |
290 |
19,807 |
12,110 |
35,638 |
| Valley |
19 |
1,013 |
49 |
3,417 |
2,373 |
6,871 |
| Washington |
12 |
401 |
29 |
3,527 |
1,247 |
5,216 |
| Total |
3,142 |
109,068 |
8,045 |
435,246 |
302,335 |
857,836 |