The county name is a link to the specific voting instructions for each voting system.
| County | Phone | County Seat | Zip Code | Voting System Used |
|---|---|---|---|---|
| Ada | 287-6860 | Boise | 83702 | Optical Scan - Other |
| Adams | 253-4561 | Council | 83612 | Paper |
| Bannock | 236-7329 | Pocatello | 83205 | Optical Scan - Oval |
| Bear Lake | 945-2212 | Paris | 83261 | Paper |
| Benewah | 245-3212 | St Maries | 83861 | Paper |
| Bingham | 782-3164 | Blackfoot | 83221 | Optical Scan - Oval |
| Blaine | 788-5510 | Hailey | 83333 | Optical Scan - Oval |
| Boise | 392-4431 | Idaho City | 83631 | Paper |
| Bonner | 255-3631 | Sandpoint | 83864 | Optical Scan - Other |
| Bonneville | 529-1363 | Idaho Falls | 83402 | Optical Scan - Other |
| Boundary | 267-2242 | Bonners Ferry | 83805 | Optical Scan - Oval |
| Butte | 527-3021 | Arco | 83213 | Paper |
| Camas | 764-2242 | Fairfield | 83327 | Paper |
| Canyon | 454-7562 | Caldwell | 83605 | Optical Scan - Oval |
| Caribou | 547-4324 | Soda Springs | 83276 | Optical Scan - Other |
| Cassia | 878-5240 | Burley | 83318 | Optical Scan - Oval |
| Clark | 374-5304 | Dubois | 83423 | Paper |
| Clearwater | 476-5615 | Orofino | 83544 | Optical Scan - Oval |
| Custer | 879-2360 | Challis | 83226 | Paper |
| Elmore | 587-2131 | Mountain Home | 83647 | Optical Scan - Oval |
| Franklin | 852-1090 | Preston | 83263 | Optical Scan - Other |
| Fremont | 624-7332 | St Anthony | 83445 | Optical Scan - Oval |
| Gem | 365-4561 | Emmett | 83617 | Optical Scan - Oval |
| Gooding | 934-4841 | Gooding | 83330 | Optical Scan - Oval |
| Idaho | 983-2751 | Grangeville | 83530 | Paper |
| Jefferson | 745-7756 | Rigby | 83442 | Optical Scan - Oval |
| Jerome | 644-2714 | Jerome | 83338 | Optical Scan - Oval |
| Kootenai | 446-1030 | Coeur d’Alene | 83816 | Optical Scan - Oval |
| Latah | 883-2249 | Moscow | 83843 | Optical Scan - Oval |
| Lemhi | 756-2815 | Salmon | 83467 | Optical Scan - Oval |
| Lewis | 937-2661 | Nezperce | 83543 | Paper |
| Lincoln | 886-7641 | Shoshone | 83352 | Optical Scan - Oval |
| Madison | 359-6219 | Rexburg | 83440 | Optical Scan - Oval |
| Minidoka | 436-9511 | Rupert | 83350 | Optical Scan - Oval |
| Nez Perce | 799-3020 | Lewiston | 83501 | Optical Scan - Oval |
| Oneida | 766-4116 | Malad | 83252 | Optical Scan - Oval |
| Owyhee | 495-2421 | Murphy | 83650 | Paper |
| Payette | 642-6000 | Payette | 83661 | Optical Scan - Oval |
| Power | 226-7611 | American Falls | 83211 | Optical Scan - Oval |
| Shoshone | 752-1264 | Wallace | 83873 | Optical Scan - Oval |
| Teton | 354-8780 | Driggs | 83422 | Optical Scan - Oval |
| Twin Falls | 736-4004 | Twin Falls | 83303 | Optical Scan - Oval |
| Valley | 382-7100 | Cascade | 83611 | Optical Scan - Oval |
| Washington | 414-2092 | Weiser | 83672 | Paper |