The graph below ranks each Idaho County by total residents according to the 2012 census estimates.
Idaho total population by county
| County | Total Population |
| Ada |  408,853 |
| Canyon | 193,788 |
| Kootenai | 142,278 |
| Bonneville | 106,864 |
| Bannock | 83,683 |
| Twin Falls | 78,515 |
| Bingham | 45,466 |
| Bonner | 40,456 |
| Nez Perce | 39,580 |
| Latah | 38,055 |
| Madison | 37,650 |
| Jefferson | 26,699 |
| Elmore | 26,292 |
| Cassia | 23,255 |
| Payette | 22,676 |
| Jerome | 22,461 |
| Blaine | 21,141 |
| Minidoka | 20,088 |
| Gem | 16,698 |
| Idaho | 16,327 |
| Gooding | 15,208 |
| Fremont | 12,980 |
| Franklin | 12,805 |
| Shoshone | 12,704 |
| Owyhee | 11,458 |
| Boundary | 10,832 |
| Teton | 10,069 |
| Washington | 10,041 |
| Valley | 9,524 |
| Benewah | 9,146 |
| Clearwater | 8,583 |
| Power | 7,802 |
| Lemhi | 7,762 |
| Boise | 6,825 |
| Caribou | 6,778 |
| Bear Lake | 5,904 |
| Lincoln | 5,275 |
| Custer | 4,340 |
| Oneida | 4,233 |
| Adams | 3,914 |
| Lewis | 3,894 |
| Butte | 2,738 |
| Camas | 1,076 |
| Clark | 874 |