Voter Registration Totals as of January 8, 2019
| Cong. Dist. |
Total Registered |
| 1 |
456,175 |
| 2 |
411,673 |
| Total |
867,848 |
| Leg. Dist. |
Total Registered |
| 1 |
29,566 |
| 2 |
29,344 |
| 3 |
25,729 |
| 4 |
26,831 |
| 5 |
27,959 |
| 6 |
23,443 |
| 7 |
24,595 |
| 8 |
29,794 |
| 9 |
23,669 |
| 10 |
19,670 |
| 11 |
23,963 |
| 12 |
20,015 |
| 13 |
23,695 |
| 14 |
36,938 |
| 15 |
25,022 |
| 16 |
27,035 |
| 17 |
24,255 |
| 18 |
30,805 |
| 19 |
33,164 |
| 20 |
27,166 |
| 21 |
30,372 |
| 22 |
23,311 |
| 23 |
18,846 |
| 24 |
20,590 |
| 25 |
19,650 |
| 26 |
23,041 |
| 27 |
17,681 |
| 28 |
23,793 |
| 29 |
21,011 |
| 30 |
25,367 |
| 31 |
20,324 |
| 32 |
25,224 |
| 33 |
20,270 |
| 34 |
23,481 |
| 35 |
22,229 |
| Total |
867,848 |
| County |
Total Registered |
| Ada |
258,068 |
| Adams |
2,677 |
| Bannock |
41,359 |
| Bear Lake |
3,384 |
| Benewah |
5,300 |
| Bingham |
20,324 |
| Blaine |
13,791 |
| Boise |
4,944 |
| Bonner |
26,822 |
| Bonneville |
53,001 |
| Boundary |
6,401 |
| Butte |
1,497 |
| Camas |
719 |
| Canyon |
91,514 |
| Caribou |
3,687 |
| Cassia |
9,648 |
| Clark |
376 |
| Clearwater |
4,467 |
| Custer |
2,906 |
| Elmore |
10,825 |
| Franklin |
6,401 |
| Fremont |
6,755 |
| Gem |
10,002 |
| Gooding |
6,419 |
| Idaho |
10,016 |
| Jefferson |
13,601 |
| Jerome |
7,345 |
| Kootenai |
81,904 |
| Latah |
22,659 |
| Lemhi |
4,977 |
| Lewis |
2,116 |
| Lincoln |
2,112 |
| Madison |
19,110 |
| Minidoka |
8,033 |
| Nez Perce |
21,327 |
| Oneida |
2,523 |
| Owyhee |
5,206 |
| Payette |
11,579 |
| Power |
3,445 |
| Shoshone |
6,455 |
| Teton |
6,236 |
| Twin Falls |
35,710 |
| Valley |
6,965 |
| Washington |
5,242 |
| Total |
867,848 |