Voter Registration Totals as of April 2, 2019
| County |
Constitution |
Democratic |
Libertarian |
Republican |
Unaffiliated |
Total Registered |
| Ada |
647 |
46,745 |
3,026 |
104,334 |
96,698 |
251,450 |
| Adams |
16 |
186 |
14 |
1,701 |
681 |
2,598 |
| Bannock |
137 |
4,994 |
413 |
17,170 |
18,398 |
41,112 |
| Bear Lake |
17 |
119 |
14 |
2,653 |
636 |
3,439 |
| Benewah |
23 |
531 |
33 |
2,446 |
2,019 |
5,052 |
| Bingham |
77 |
1,703 |
89 |
12,560 |
5,610 |
20,039 |
| Blaine |
14 |
3,135 |
112 |
3,295 |
6,745 |
13,301 |
| Boise |
25 |
352 |
42 |
2,945 |
1,425 |
4,789 |
| Bonner |
149 |
2,713 |
246 |
15,062 |
8,095 |
26,265 |
| Bonneville |
185 |
4,183 |
439 |
30,039 |
18,041 |
52,887 |
| Boundary |
26 |
435 |
56 |
4,167 |
1,546 |
6,230 |
| Butte |
5 |
65 |
4 |
1,140 |
277 |
1,491 |
| Camas |
6 |
37 |
6 |
456 |
208 |
713 |
| Canyon |
398 |
10,288 |
880 |
46,713 |
32,206 |
90,485 |
| Caribou |
20 |
114 |
15 |
2,718 |
845 |
3,712 |
| Cassia |
31 |
510 |
42 |
6,763 |
2,102 |
9,448 |
| Clark |
2 |
18 |
2 |
319 |
56 |
397 |
| Clearwater |
13 |
357 |
29 |
2,255 |
1,706 |
4,360 |
| Custer |
4 |
148 |
19 |
1,989 |
648 |
2,808 |
| Elmore |
46 |
1,012 |
90 |
6,016 |
3,336 |
10,500 |
| Franklin |
47 |
175 |
30 |
4,607 |
1,311 |
6,170 |
| Fremont |
28 |
292 |
25 |
5,077 |
1,309 |
6,731 |
| Gem |
52 |
632 |
57 |
6,207 |
2,603 |
9,551 |
| Gooding |
21 |
557 |
36 |
3,773 |
1,733 |
6,120 |
| Idaho |
33 |
570 |
58 |
6,619 |
2,442 |
9,722 |
| Jefferson |
49 |
441 |
55 |
10,027 |
2,996 |
13,568 |
| Jerome |
86 |
732 |
49 |
4,453 |
2,656 |
7,976 |
| Kootenai |
357 |
8,976 |
763 |
44,476 |
27,494 |
82,066 |
| Latah |
75 |
4,686 |
310 |
7,593 |
9,927 |
22,591 |
| Lemhi |
13 |
391 |
34 |
3,377 |
1,391 |
5,206 |
| Lewis |
6 |
161 |
10 |
1,248 |
561 |
1,986 |
| Lincoln |
9 |
167 |
16 |
1,310 |
601 |
2,103 |
| Madison |
101 |
614 |
198 |
12,921 |
4,644 |
18,478 |
| Minidoka |
25 |
591 |
36 |
4,841 |
2,237 |
7,730 |
| Nez Perce |
74 |
2,603 |
132 |
8,730 |
9,715 |
21,254 |
| Oneida |
8 |
96 |
21 |
1,901 |
482 |
2,508 |
| Owyhee |
30 |
434 |
35 |
3,246 |
1,401 |
5,146 |
| Payette |
40 |
939 |
68 |
6,412 |
3,526 |
10,985 |
| Power |
8 |
384 |
11 |
1,692 |
1,189 |
3,284 |
| Shoshone |
21 |
1,326 |
31 |
2,479 |
2,574 |
6,431 |
| Teton |
14 |
1,286 |
61 |
2,423 |
2,446 |
6,230 |
| Twin Falls |
136 |
3,266 |
280 |
19,901 |
11,999 |
35,582 |
| Valley |
18 |
1,007 |
47 |
3,405 |
2,326 |
6,803 |
| Washington |
12 |
397 |
28 |
3,549 |
1,237 |
5,223 |
| Total |
3,104 |
108,368 |
7,962 |
435,008 |
300,078 |
854,520 |