Voter Registration Totals as of February 1, 2019
| County |
Constitution |
Democratic |
Libertarian |
Republican |
Unaffiliated |
Total Registered |
| Ada |
665 |
47,890 |
3,144 |
106,558 |
100,904 |
259,161 |
| Adams |
16 |
190 |
14 |
1,742 |
709 |
2,671 |
| Bannock |
136 |
4,994 |
411 |
17,192 |
18,402 |
41,135 |
| Bear Lake |
16 |
119 |
12 |
2,613 |
612 |
3,372 |
| Benewah |
22 |
535 |
33 |
2,451 |
1,998 |
5,039 |
| Bingham |
79 |
1,720 |
90 |
12,682 |
5,727 |
20,298 |
| Blaine |
16 |
3,200 |
119 |
3,381 |
7,060 |
13,776 |
| Boise |
25 |
348 |
42 |
2,936 |
1,416 |
4,767 |
| Bonner |
154 |
2,746 |
248 |
15,281 |
8,347 |
26,776 |
| Bonneville |
186 |
4,195 |
438 |
30,105 |
18,053 |
52,977 |
| Boundary |
26 |
434 |
56 |
4,148 |
1,525 |
6,189 |
| Butte |
5 |
65 |
4 |
1,141 |
279 |
1,494 |
| Camas |
6 |
37 |
6 |
463 |
206 |
718 |
| Canyon |
435 |
10,653 |
928 |
47,998 |
34,227 |
94,241 |
| Caribou |
20 |
114 |
15 |
2,711 |
844 |
3,704 |
| Cassia |
31 |
507 |
42 |
6,723 |
2,064 |
9,367 |
| Clark |
2 |
17 |
2 |
304 |
49 |
374 |
| Clearwater |
13 |
375 |
30 |
2,284 |
1,752 |
4,454 |
| Custer |
4 |
157 |
19 |
2,033 |
674 |
2,887 |
| Elmore |
46 |
1,015 |
90 |
6,017 |
3,341 |
10,509 |
| Franklin |
46 |
180 |
30 |
4,756 |
1,362 |
6,374 |
| Fremont |
28 |
296 |
25 |
5,075 |
1,303 |
6,727 |
| Gem |
53 |
631 |
56 |
6,211 |
2,600 |
9,551 |
| Gooding |
23 |
586 |
35 |
3,878 |
1,878 |
6,400 |
| Idaho |
33 |
569 |
55 |
6,625 |
2,405 |
9,687 |
| Jefferson |
49 |
441 |
55 |
10,040 |
3,003 |
13,588 |
| Jerome |
86 |
722 |
48 |
4,435 |
2,636 |
7,927 |
| Kootenai |
356 |
8,955 |
758 |
44,368 |
27,357 |
81,794 |
| Latah |
76 |
4,701 |
311 |
7,603 |
9,958 |
22,649 |
| Lemhi |
11 |
386 |
33 |
3,291 |
1,248 |
4,969 |
| Lewis |
5 |
164 |
10 |
1,239 |
549 |
1,967 |
| Lincoln |
9 |
168 |
16 |
1,311 |
602 |
2,106 |
| Madison |
99 |
643 |
201 |
13,281 |
4,821 |
19,045 |
| Minidoka |
25 |
590 |
36 |
4,819 |
2,217 |
7,687 |
| Nez Perce |
74 |
2,609 |
134 |
8,742 |
9,744 |
21,303 |
| Oneida |
7 |
99 |
20 |
1,916 |
479 |
2,521 |
| Owyhee |
30 |
432 |
35 |
3,246 |
1,399 |
5,142 |
| Payette |
43 |
986 |
76 |
6,614 |
3,793 |
11,512 |
| Power |
8 |
382 |
10 |
1,687 |
1,180 |
3,267 |
| Shoshone |
21 |
1,328 |
32 |
2,483 |
2,563 |
6,427 |
| Teton |
14 |
1,286 |
61 |
2,426 |
2,445 |
6,232 |
| Twin Falls |
137 |
3,265 |
280 |
19,913 |
11,976 |
35,571 |
| Valley |
18 |
1,021 |
47 |
3,473 |
2,393 |
6,952 |
| Washington |
12 |
397 |
28 |
3,552 |
1,242 |
5,231 |
| Total |
3,166 |
110,148 |
8,135 |
439,747 |
307,342 |
868,538 |