Listing of counties in Idaho. State nickname: Gem State Other U.S. States Capital Boise Largest city Boise Governor Dirk Kempthorne Official languages none Area 216,632 km² (14th)  - Land 214,499 km²  - Water 2,133 km² (0. ...

• Ada County
• Adams County
• Bannock County
• Bear Lake County
• Benewah County
• Bingham County
• Blaine County
• Boise County
• Bonner County
• Bonneville County
• Boundary County
• Butte County
• Camas County
• Canyon County
• Caribou County
• Cassia County
• Clark County
• Clearwater County
• Custer County
• Elmore County
• Franklin County
• Fremont County
• Gem County
• Gooding County
• Idaho County
• Jefferson County
• Jerome County
• Kootenai County
• Latah County
• Lemhi County
• Lewis County
• Lincoln County
• Madison County
• Minidoka County
• Nez Perce County
• Oneida County
• Owyhee County
• Payette County
• Power County
• Shoshone County
• Teton County
• Twin Falls County
• Valley County
• Washington County

Ada County is a county located in the state of Idaho. ... Adams County is a county located in the U.S. state of Idaho. ... Bannock County is a county located in the state of Idaho. ... Bear Lake County is a county located in the southeastern corner of the state of Idaho. ... Benewah County is a county located in the state of Idaho. ... Bingham County is a county located in the state of Idaho. ... Blaine County is a county located in the state of Idaho. ... Boise County is a county located in the state of Idaho. ... Bonner County is a county located in the state of Idaho. ... Bonneville County is a county located in the state of Idaho. ... Boundary County is a county located in the state of Idaho. ... Butte County is a county located in the state of Idaho. ... Camas County is a county located in the state of Idaho. ... Canyon County is a county located in the state of Idaho. ... Caribou County is a county of the state of Idaho. ... Cassia County is a county located in the state of Idaho. ... Clark County is a county located in the state of Idaho. ... Clearwater County is a county located in the state of Idaho. ... Custer County is a county located in the state of Idaho. ... Elmore County is a county located in the state of Idaho. ... Franklin County is a county located in the state of Idaho. ... Fremont County is a county located in the state of Idaho. ... Gem County is a county located in the state of Idaho. ... Gooding County is a county located in the state of Idaho. ... Idaho County is a county located in the state of Idaho. ... Jefferson County is a county located in the state of Idaho. ... Jerome County is a county located in the state of Idaho. ... Kootenai County is a county located in the state of Idaho. ... Latah County is a county located in the state of Idaho. ... Lemhi County is a county located in the state of Idaho. ... Lewis County is a county located in the state of Idaho. ... Lincoln County is a county located in the state of Idaho. ... Madison County is a county located in the state of Idaho in the Upper Snake River Valley. ... Minidoka County is a county located in the state of Idaho. ... Nez Perce County is a county located in the northern part of the state of Idaho along the border with Washington state. ... Oneida County is a county located in the state of Idaho. ... Owyhee County is a county located in the state of Idaho. ... Payette County is a county located in the state of Idaho. ... Power County is a county located in the state of Idaho. ... Shoshone County is a county located in the state of Idaho. ... Teton County is a county located in the state of Idaho. ... Twin Falls County is a county located in the state of Idaho. ... Valley County is a county located in the state of Idaho. ... Washington County is a county located in the state of Idaho. ...

Defunct Idaho counties

• Alturas County: A huge south-central Idaho county formed in 1864. Abolished in 1895.
• Lah-Toh County: North Idaho county formed in 1864. Abolished in 1867.
• Logan County: Formed by an 1889 partition of Alturas County. Abolished in 1895.