All counties in Idaho
| County Name | Population | State | Rank |
|---|
| Ada County | 392,365 | Idaho | 1 |
| Canyon County | 188,923 | Idaho | 2 |
| Kootenai County | 138,494 | Idaho | 3 |
| Bonneville County | 104,234 | Idaho | 4 |
| Bannock County | 82,839 | Idaho | 5 |
| Twin Falls County | 77,230 | Idaho | 6 |
| Bingham County | 45,607 | Idaho | 7 |
| Bonner County | 40,877 | Idaho | 8 |
| Nez Perce County | 39,265 | Idaho | 9 |
| Madison County | 37,536 | Idaho | 10 |
| Latah County | 37,244 | Idaho | 11 |
| Elmore County | 27,038 | Idaho | 12 |
| Jefferson County | 26,140 | Idaho | 13 |
| Cassia County | 22,952 | Idaho | 14 |
| Payette County | 22,623 | Idaho | 15 |
| Jerome County | 22,374 | Idaho | 16 |
| Blaine County | 21,376 | Idaho | 17 |
| Minidoka County | 20,069 | Idaho | 18 |
| Gem County | 16,719 | Idaho | 19 |
| Idaho County | 16,267 | Idaho | 20 |
| Gooding County | 15,464 | Idaho | 21 |
| Fremont County | 13,242 | Idaho | 22 |
| Franklin County | 12,786 | Idaho | 23 |
| Shoshone County | 12,765 | Idaho | 24 |
| Owyhee County | 11,526 | Idaho | 25 |
| Boundary County | 10,972 | Idaho | 26 |
| Washington County | 10,198 | Idaho | 27 |
| Teton County | 10,170 | Idaho | 28 |
| Valley County | 9,862 | Idaho | 29 |
| Benewah County | 9,285 | Idaho | 30 |
| Clearwater County | 8,761 | Idaho | 31 |
| Lemhi County | 7,936 | Idaho | 32 |
| Power County | 7,817 | Idaho | 33 |
| Boise County | 7,028 | Idaho | 34 |
| Caribou County | 6,963 | Idaho | 35 |
| Bear Lake County | 5,986 | Idaho | 36 |
| Lincoln County | 5,208 | Idaho | 37 |
| Custer County | 4,368 | Idaho | 38 |
| Oneida County | 4,286 | Idaho | 39 |
| Adams County | 3,976 | Idaho | 40 |
| Lewis County | 3,821 | Idaho | 41 |
| Butte County | 2,891 | Idaho | 42 |
| Camas County | 1,117 | Idaho | 43 |
| Clark County | 982 | Idaho | 44 |