Voter Registration Totals as of January 8, 2019
| County |
Constitution |
Democratic |
Libertarian |
Republican |
Unaffiliated |
Total Registered |
| Ada |
663 |
47,664 |
3,121 |
106,138 |
100,482 |
258,068 |
| Adams |
16 |
191 |
14 |
1,745 |
711 |
2,677 |
| Bannock |
137 |
5,027 |
416 |
17,264 |
18,515 |
41,359 |
| Bear Lake |
16 |
120 |
12 |
2,620 |
616 |
3,384 |
| Benewah |
23 |
551 |
33 |
2,510 |
2,183 |
5,300 |
| Bingham |
80 |
1,721 |
91 |
12,703 |
5,729 |
20,324 |
| Blaine |
16 |
3,203 |
119 |
3,385 |
7,068 |
13,791 |
| Boise |
26 |
364 |
44 |
3,008 |
1,502 |
4,944 |
| Bonner |
154 |
2,743 |
247 |
15,349 |
8,329 |
26,822 |
| Bonneville |
186 |
4,184 |
437 |
30,131 |
18,063 |
53,001 |
| Boundary |
30 |
443 |
56 |
4,237 |
1,635 |
6,401 |
| Butte |
5 |
65 |
4 |
1,144 |
279 |
1,497 |
| Camas |
6 |
37 |
6 |
463 |
207 |
719 |
| Canyon |
420 |
10,141 |
872 |
46,875 |
33,206 |
91,514 |
| Caribou |
19 |
109 |
14 |
2,708 |
837 |
3,687 |
| Cassia |
31 |
528 |
43 |
6,856 |
2,190 |
9,648 |
| Clark |
2 |
17 |
2 |
306 |
49 |
376 |
| Clearwater |
13 |
377 |
30 |
2,289 |
1,758 |
4,467 |
| Custer |
4 |
157 |
19 |
2,051 |
675 |
2,906 |
| Elmore |
47 |
1,044 |
94 |
6,137 |
3,503 |
10,825 |
| Franklin |
46 |
183 |
31 |
4,774 |
1,367 |
6,401 |
| Fremont |
28 |
298 |
25 |
5,094 |
1,310 |
6,755 |
| Gem |
55 |
666 |
60 |
6,389 |
2,832 |
10,002 |
| Gooding |
23 |
587 |
34 |
3,893 |
1,882 |
6,419 |
| Idaho |
38 |
590 |
56 |
6,787 |
2,545 |
10,016 |
| Jefferson |
49 |
440 |
55 |
10,048 |
3,009 |
13,601 |
| Jerome |
87 |
612 |
40 |
4,189 |
2,417 |
7,345 |
| Kootenai |
355 |
8,974 |
761 |
44,428 |
27,386 |
81,904 |
| Latah |
75 |
4,694 |
311 |
7,626 |
9,953 |
22,659 |
| Lemhi |
11 |
390 |
32 |
3,297 |
1,247 |
4,977 |
| Lewis |
7 |
173 |
10 |
1,287 |
639 |
2,116 |
| Lincoln |
9 |
169 |
16 |
1,314 |
604 |
2,112 |
| Madison |
98 |
648 |
201 |
13,319 |
4,844 |
19,110 |
| Minidoka |
26 |
621 |
37 |
4,980 |
2,369 |
8,033 |
| Nez Perce |
74 |
2,613 |
134 |
8,752 |
9,754 |
21,327 |
| Oneida |
7 |
99 |
20 |
1,918 |
479 |
2,523 |
| Owyhee |
31 |
437 |
36 |
3,283 |
1,419 |
5,206 |
| Payette |
42 |
994 |
75 |
6,648 |
3,820 |
11,579 |
| Power |
8 |
404 |
12 |
1,749 |
1,272 |
3,445 |
| Shoshone |
21 |
1,336 |
32 |
2,492 |
2,574 |
6,455 |
| Teton |
14 |
1,286 |
61 |
2,428 |
2,447 |
6,236 |
| Twin Falls |
140 |
3,280 |
280 |
19,983 |
12,027 |
35,710 |
| Valley |
19 |
1,024 |
47 |
3,478 |
2,397 |
6,965 |
| Washington |
12 |
398 |
28 |
3,560 |
1,244 |
5,242 |
| Total |
3,169 |
109,602 |
8,068 |
439,635 |
307,374 |
867,848 |