Voter Registration Totals as of October 1, 2018
| Cong. Dist. |
Total Registered |
| 1 |
435,225 |
| 2 |
392,280 |
| Total |
827,505 |
| Leg. Dist. |
Total Registered |
| 01 |
27,932 |
| 02 |
28,581 |
| 03 |
24,626 |
| 04 |
26,082 |
| 05 |
27,219 |
| 06 |
23,141 |
| 07 |
23,813 |
| 08 |
28,004 |
| 09 |
22,359 |
| 10 |
17,779 |
| 11 |
24,021 |
| 12 |
20,080 |
| 13 |
21,695 |
| 14 |
35,082 |
| 15 |
23,460 |
| 16 |
24,951 |
| 17 |
21,915 |
| 18 |
28,364 |
| 19 |
30,704 |
| 20 |
25,640 |
| 21 |
28,255 |
| 22 |
21,653 |
| 23 |
17,841 |
| 24 |
19,838 |
| 25 |
19,992 |
| 26 |
21,757 |
| 27 |
16,931 |
| 28 |
23,275 |
| 29 |
20,753 |
| 30 |
24,298 |
| 31 |
19,303 |
| 32 |
24,453 |
| 33 |
19,479 |
| 34 |
22,408 |
| 35 |
21,821 |
| Total |
827,505 |
| County |
Total Registered |
| Ada |
240,024 |
| Adams |
2,538 |
| Bannock |
40,759 |
| Bear Lake |
3,297 |
| Benewah |
5,105 |
| Bingham |
19,303 |
| Blaine |
12,852 |
| Boise |
4,600 |
| Bonner |
25,207 |
| Bonneville |
50,923 |
| Boundary |
6,156 |
| Butte |
1,479 |
| Camas |
682 |
| Canyon |
87,463 |
| Caribou |
3,621 |
| Cassia |
9,269 |
| Clark |
383 |
| Clearwater |
4,372 |
| Custer |
2,804 |
| Elmore |
10,197 |
| Franklin |
6,096 |
| Fremont |
6,647 |
| Gem |
9,420 |
| Gooding |
6,129 |
| Idaho |
9,609 |
| Jefferson |
13,312 |
| Jerome |
7,953 |
| Kootenai |
79,289 |
| Latah |
22,114 |
| Lemhi |
4,770 |
| Lewis |
2,021 |
| Lincoln |
2,094 |
| Madison |
18,152 |
| Minidoka |
7,662 |
| Nez Perce |
21,120 |
| Oneida |
2,457 |
| Owyhee |
4,871 |
| Payette |
10,793 |
| Power |
3,269 |
| Shoshone |
6,401 |
| Teton |
6,092 |
| Twin Falls |
34,650 |
| Valley |
6,410 |
| Washington |
5,140 |
| Total |
827,505 |