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| Ada | Obama | 45.5% | 82,236 | | | McCain | 51.6% | 93,328 | | | Other | 2.9% | 5,196 | |
| Adams | Obama | 31.4% | 728 | | | McCain | 65.4% | 1,517 | | | Other | 3.2% | 75 | |
| Bannock | Obama | 41.7% | 14,792 | | | McCain | 54.6% | 19,356 | | | Other | 3.6% | 1,289 | |
| Bear Lake | Obama | 17.1% | 502 | | | McCain | 80.8% | 2,377 | | | Other | 2.2% | 64 | |
| Benewah | Obama | 33.8% | 1,407 | | | McCain | 63.5% | 2,646 | | | Other | 2.7% | 111 | |
| Bingham | Obama | 25.8% | 4,424 | | | McCain | 71.3% | 12,230 | | | Other | 2.9% | 502 | |
| Blaine | Obama | 65.7% | 6,947 | | | McCain | 32.5% | 3,439 | | | Other | 1.8% | 187 | |
| Boise | Obama | 32.9% | 1,240 | | | McCain | 64.5% | 2,433 | | | Other | 2.7% | 100 | |
| Bonner | Obama | 40.1% | 7,840 | | | McCain | 57.0% | 11,145 | | | Other | 2.9% | 565 | |
| Bonneville | Obama | 27.4% | 11,417 | | | McCain | 70.3% | 29,334 | | | Other | 2.3% | 952 | |
| Boundary | Obama | 31.3% | 1,484 | | | McCain | 65.0% | 3,078 | | | Other | 3.6% | 172 | |
| Butte | Obama | 22.6% | 318 | | | McCain | 74.9% | 1,056 | | | Other | 2.6% | 36 | |
| Camas | Obama | 30.3% | 187 | | | McCain | 68.3% | 422 | | | Other | 1.5% | 9 | |
| Canyon | Obama | 31.1% | 20,147 | | | McCain | 66.1% | 42,752 | | | Other | 2.8% | 1,807 | |
| Caribou | Obama | 16.7% | 553 | | | McCain | 80.4% | 2,656 | | | Other | 2.8% | 93 | |
| Cassia | Obama | 16.9% | 1,332 | | | McCain | 79.9% | 6,309 | | | Other | 3.2% | 252 | |
| Clark | Obama | 17.1% | 64 | | | McCain | 81.3% | 305 | | | Other | 1.6% | 6 | |
| Clearwater | Obama | 31.0% | 1,211 | | | McCain | 65.8% | 2,569 | | | Other | 3.2% | 126 | |
| Custer | Obama | 26.0% | 611 | | | McCain | 72.0% | 1,694 | | | Other | 2.0% | 48 | |
| Elmore | Obama | 30.5% | 2,591 | | | McCain | 66.8% | 5,665 | | | Other | 2.7% | 230 | |
| Franklin | Obama | 11.8% | 600 | | | McCain | 83.7% | 4,246 | | | Other | 4.5% | 228 | |
| Fremont | Obama | 18.1% | 1,065 | | | McCain | 79.9% | 4,700 | | | Other | 2.0% | 116 | |
| Gem | Obama | 27.3% | 2,166 | | | McCain | 70.3% | 5,585 | | | Other | 2.5% | 197 | |
| Gooding | Obama | 27.6% | 1,489 | | | McCain | 69.8% | 3,765 | | | Other | 2.5% | 137 | |
| Idaho | Obama | 24.6% | 2,017 | | | McCain | 71.8% | 5,895 | | | Other | 3.7% | 300 | |
| Jefferson | Obama | 15.7% | 1,641 | | | McCain | 81.8% | 8,540 | | | Other | 2.5% | 260 | |
| Jerome | Obama | 26.2% | 1,794 | | | McCain | 71.5% | 4,897 | | | Other | 2.3% | 156 | |
| Kootenai | Obama | 35.4% | 22,120 | | | McCain | 61.4% | 38,387 | | | Other | 3.2% | 2,028 | |
| Latah | Obama | 51.3% | 9,195 | | | McCain | 44.6% | 7,988 | | | Other | 4.1% | 733 | |
| Lemhi | Obama | 25.8% | 1,061 | | | McCain | 71.6% | 2,938 | | | Other | 2.6% | 106 | |
| Lewis | Obama | 26.6% | 479 | | | McCain | 70.7% | 1,275 | | | Other | 2.8% | 50 | |
| Lincoln | Obama | 29.1% | 545 | | | McCain | 65.9% | 1,232 | | | Other | 5.0% | 93 | |
| Madison | Obama | 12.5% | 1,627 | | | McCain | 85.2% | 11,131 | | | Other | 2.3% | 300 | |
| Minidoka | Obama | 23.7% | 1,630 | | | McCain | 73.8% | 5,087 | | | Other | 2.5% | 173 | |
| Nez Perce | Obama | 40.0% | 7,123 | | | McCain | 58.1% | 10,357 | | | Other | 1.9% | 343 | |
| Oneida | Obama | 17.6% | 381 | | | McCain | 79.7% | 1,724 | | | Other | 2.6% | 57 | |
| Owyhee | Obama | 23.3% | 944 | | | McCain | 74.5% | 3,024 | | | Other | 2.2% | 90 | |
| Payette | Obama | 27.8% | 2,415 | | | McCain | 68.9% | 5,988 | | | Other | 3.3% | 290 | |
| Power | Obama | 36.1% | 1,027 | | | McCain | 61.7% | 1,754 | | | Other | 2.1% | 61 | |
| Shoshone | Obama | 44.5% | 2,521 | | | McCain | 52.1% | 2,953 | | | Other | 3.4% | 193 | |
| Teton | Obama | 49.4% | 2,302 | | | McCain | 48.6% | 2,263 | | | Other | 2.0% | 94 | |
| Twin Falls | Obama | 30.1% | 8,621 | | | McCain | 66.5% | 19,032 | | | Other | 3.4% | 960 | |
| Valley | Obama | 45.4% | 2,405 | | | McCain | 52.3% | 2,772 | | | Other | 2.3% | 120 | |
| Washington | Obama | 27.5% | 1,241 | | | McCain | 70.3% | 3,168 | | | Other | 2.2% | 97 | |
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