Counties in Idaho
Idaho has 44 counties. They are listed by population, largest first, starting with Ada County, Canyon County, and Kootenai County.
- Ada County, Idaho
- Canyon County, Idaho
- Kootenai County, Idaho
- Bonneville County, Idaho
- Twin Falls County, Idaho
- Bannock County, Idaho
- Madison County, Idaho
- Bonner County, Idaho
- Bingham County, Idaho
- Nez Perce County, Idaho
- Latah County, Idaho
- Jefferson County, Idaho
- Elmore County, Idaho
- Payette County, Idaho
- Cassia County, Idaho
- Jerome County, Idaho
- Blaine County, Idaho
- Minidoka County, Idaho
- Gem County, Idaho
- Idaho County, Idaho
- Gooding County, Idaho
- Franklin County, Idaho
- Fremont County, Idaho
- Shoshone County, Idaho
- Boundary County, Idaho
- Teton County, Idaho
- Valley County, Idaho
- Owyhee County, Idaho
- Washington County, Idaho
- Benewah County, Idaho
- Clearwater County, Idaho
- Boise County, Idaho
- Lemhi County, Idaho
- Power County, Idaho
- Caribou County, Idaho
- Bear Lake County, Idaho
- Lincoln County, Idaho
- Oneida County, Idaho
- Adams County, Idaho
- Custer County, Idaho
- Lewis County, Idaho
- Butte County, Idaho
- Camas County, Idaho
- Clark County, Idaho