| President | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| REP | REP | REP | REP | REP | REP | REP | REP | REP | REP | REP | REP | REP | CON | CON | CON | |
| Counties | Jeb Bush | Ben Carson | Chris Christie | Ted Cruz | Carly Fiorina | Lindsey Graham | Mike Huckabee | John R. Kasich | Peter Messina | Rand Paul | Marco Rubio | Rick Santorum | Donald J. Trump | Scott Copeland | J.R. Myers | Patrick Anthony Ockander |
| Ada | 172 | 724 | 68 | 20,156 | 53 | 14 | 70 | 5,306 | 2 | 170 | 8,074 | 45 | 15,191 | 48 | 23 | 18 |
| Adams | 4 | 5 | 3 | 292 | 2 | 1 | 1 | 64 | 0 | 5 | 97 | 1 | 354 | 1 | 1 | 1 |
| Bannock | 34 | 160 | 9 | 4,404 | 10 | 5 | 12 | 494 | 0 | 21 | 2,017 | 12 | 1,711 | 12 | 2 | 2 |
| Bear Lake | 14 | 42 | 3 | 643 | 1 | 0 | 5 | 92 | 0 | 6 | 330 | 8 | 363 | 1 | 2 | 0 |
| Benewah | 6 | 14 | 3 | 671 | 3 | 1 | 3 | 80 | 1 | 8 | 87 | 1 | 427 | 0 | 1 | 1 |
| Bingham | 39 | 138 | 14 | 3,471 | 18 | 1 | 15 | 304 | 0 | 22 | 1,761 | 8 | 1,191 | 10 | 4 | 4 |
| Blaine | 11 | 23 | 1 | 370 | 2 | 3 | 6 | 358 | 0 | 7 | 238 | 1 | 543 | 2 | 0 | 1 |
| Boise | 7 | 31 | 8 | 541 | 2 | 0 | 6 | 142 | 1 | 9 | 171 | 1 | 691 | 2 | 2 | 2 |
| Bonner | 23 | 107 | 14 | 3,132 | 8 | 7 | 10 | 587 | 0 | 40 | 509 | 5 | 2,410 | 17 | 9 | 3 |
| Bonneville | 59 | 231 | 29 | 7,794 | 11 | 5 | 14 | 1,070 | 3 | 59 | 4,901 | 13 | 2,702 | 26 | 14 | 9 |
| Boundary | 6 | 39 | 3 | 901 | 1 | 3 | 4 | 107 | 0 | 7 | 131 | 0 | 788 | 1 | 2 | 0 |
| Butte | 3 | 6 | 0 | 275 | 1 | 0 | 1 | 30 | 0 | 3 | 117 | 0 | 138 | 0 | 0 | 0 |
| Camas | 1 | 11 | 1 | 75 | 0 | 2 | 0 | 38 | 1 | 3 | 47 | 2 | 130 | 1 | 1 | 0 |
| Canyon | 80 | 410 | 32 | 11,164 | 25 | 9 | 29 | 1,376 | 3 | 83 | 2,987 | 16 | 7,341 | 42 | 26 | 17 |
| Caribou | 12 | 35 | 3 | 602 | 2 | 0 | 0 | 87 | 1 | 8 | 299 | 1 | 304 | 0 | 1 | 1 |
| Cassia | 68 | 144 | 12 | 2,095 | 6 | 2 | 4 | 245 | 0 | 26 | 819 | 8 | 1,025 | 1 | 0 | 3 |
| Clark | 0 | 5 | 1 | 62 | 0 | 0 | 0 | 7 | 0 | 0 | 56 | 1 | 44 | 0 | 0 | 0 |
| Clearwater | 4 | 29 | 8 | 477 | 3 | 0 | 4 | 89 | 1 | 4 | 149 | 3 | 629 | 2 | 2 | 0 |
| Custer | 8 | 22 | 4 | 285 | 3 | 2 | 3 | 91 | 1 | 3 | 174 | 3 | 430 | 0 | 0 | 0 |
| Elmore | 18 | 40 | 6 | 892 | 4 | 4 | 7 | 209 | 0 | 7 | 378 | 1 | 1,252 | 2 | 0 | 1 |
| Franklin | 21 | 66 | 5 | 1,173 | 9 | 1 | 5 | 127 | 0 | 16 | 495 | 4 | 399 | 3 | 0 | 0 |
| Fremont | 10 | 46 | 6 | 1,434 | 4 | 0 | 4 | 155 | 0 | 12 | 595 | 3 | 498 | 1 | 4 | 3 |
| Gem | 10 | 42 | 8 | 1,391 | 1 | 0 | 7 | 159 | 0 | 14 | 353 | 4 | 1,230 | 8 | 1 | 0 |
| Gooding | 11 | 36 | 3 | 863 | 0 | 0 | 3 | 133 | 0 | 6 | 210 | 1 | 679 | 0 | 0 | 0 |
| Idaho | 38 | 134 | 7 | 1,495 | 3 | 2 | 21 | 266 | 3 | 30 | 361 | 6 | 1,667 | 4 | 3 | 2 |
| Jefferson | 12 | 84 | 5 | 3,080 | 4 | 2 | 4 | 189 | 0 | 18 | 1,323 | 4 | 853 | 5 | 2 | 2 |
| Jerome | 10 | 36 | 8 | 1,164 | 3 | 0 | 3 | 185 | 1 | 3 | 231 | 2 | 754 | 7 | 1 | 2 |
| Kootenai | 68 | 336 | 23 | 11,924 | 13 | 2 | 24 | 1,528 | 4 | 88 | 1,880 | 10 | 6,516 | 23 | 7 | 12 |
| Latah | 15 | 90 | 9 | 2,102 | 4 | 0 | 10 | 324 | 0 | 13 | 430 | 1 | 894 | 3 | 3 | 1 |
| Lemhi | 8 | 51 | 5 | 597 | 2 | 1 | 9 | 198 | 0 | 12 | 335 | 2 | 757 | 0 | 1 | 1 |
| Lewis | 5 | 18 | 2 | 263 | 1 | 0 | 7 | 48 | 0 | 3 | 75 | 1 | 286 | 0 | 1 | 0 |
| Lincoln | 3 | 15 | 0 | 279 | 0 | 0 | 3 | 51 | 0 | 2 | 77 | 0 | 248 | 0 | 1 | 0 |
| Madison | 22 | 131 | 6 | 4,079 | 5 | 3 | 10 | 352 | 1 | 23 | 1,925 | 6 | 539 | 3 | 5 | 1 |
| Minidoka | 16 | 43 | 0 | 1,163 | 1 | 0 | 5 | 137 | 0 | 3 | 376 | 4 | 755 | 3 | 0 | 0 |
| Nez Perce | 19 | 93 | 6 | 1,583 | 4 | 2 | 6 | 323 | 0 | 24 | 461 | 8 | 1,419 | 9 | 5 | 5 |
| Oneida | 2 | 14 | 1 | 473 | 2 | 0 | 1 | 37 | 0 | 9 | 110 | 0 | 141 | 0 | 1 | 1 |
| Owyhee | 6 | 15 | 1 | 717 | 0 | 1 | 4 | 62 | 0 | 4 | 149 | 3 | 708 | 2 | 1 | 0 |
| Payette | 13 | 55 | 2 | 1,364 | 3 | 1 | 5 | 217 | 1 | 12 | 396 | 5 | 1,289 | 0 | 3 | 0 |
| Power | 8 | 20 | 0 | 421 | 0 | 0 | 3 | 57 | 0 | 2 | 183 | 0 | 184 | 0 | 0 | 0 |
| Shoshone | 11 | 32 | 4 | 591 | 3 | 1 | 6 | 86 | 0 | 11 | 146 | 1 | 632 | 1 | 1 | 0 |
| Teton | 4 | 20 | 2 | 465 | 0 | 0 | 1 | 101 | 0 | 1 | 196 | 1 | 238 | 2 | 0 | 0 |
| Twin Falls | 36 | 167 | 18 | 4,717 | 13 | 4 | 17 | 661 | 1 | 24 | 1,202 | 12 | 2,757 | 5 | 8 | 3 |
| Valley | 7 | 25 | 4 | 476 | 5 | 1 | 2 | 197 | 0 | 3 | 188 | 0 | 575 | 2 | 1 | 0 |
| Washington | 15 | 68 | 6 | 783 | 7 | 0 | 4 | 145 | 3 | 10 | 261 | 3 | 766 | 1 | 0 | 0 |
| Total | 939 | 3,853 | 353 | 100,889 | 242 | 80 | 358 | 16,514 | 28 | 834 | 35,290 | 211 | 62,413 | 250 | 139 | 96 |
| Plurality | 38,476 | 111 | ||||||||||||||
| Precentage | 0.4% | 1.7% | 0.2% | 45.4% | 0.1% | 0.0% | 0.2% | 7.4% | 0.0% | 0.4% | 15.9% | 0.1% | 28.1% | 51.5% | 28.7% | 19.8% |