Idaho is divided into political
jurisdictions designated as counties.
Since 1919 there are 44 counties in the state, ranging in size from
410 to 8,502 square miles.
County | County seat |
Year founded |
Administrator |
---|---|---|---|
Ada | Boise | 1864 | |
Adams | Council | 1911 | |
Bannock | Pocatello | 1893 | |
Bear Lake | Paris | 1893 | |
Benewah | St. Maries | 1915 | |
Bingham | Blackfoot | 1885 | |
Blaine | Hailey | 1895 | |
Boise | Idaho City | 1864 | |
Bonner | Sandpoint | 1907 | |
Bonneville | Idaho Falls | 1911 | |
Boundary | Bonners Ferry | 1915 | |
Butte | Arco | 1917 | |
Camas | Fairfield | 1917 | |
Canyon | Caldwell | 1891 | |
Caribou | Soda Springs | 1919 | |
Cassia | Burley | 1879 | |
Clark | Dubois | 1919 | |
Clearwater | Orofino | 1911 | |
Custer | Challis | 1881 | |
Elmore | Mountain Home | 1889 | |
Franklin | Preston | 1913 | |
Fremont | St. Anthony | 1893 | |
Gem | Emmett | 1915 | |
Gooding | Gooding | 1913 | |
Idaho | Grangeville | 1861/1864 | |
Jefferson | Rigby | 1913 | |
Jerome | Jerome | 1919 | |
Kootenai | Coeur d'Alene | 1864 | |
Latah | Moscow | 1888 | |
Lemhi | Salmon | 1869 | |
Lewis | Nezperce | 1911 | |
Lincoln | Shoshone | 1895 | |
Madison | Rexburg | 1914 | |
Minidoka | Rupert | 1913 | |
Nez Perce | Lewiston | 1861/1864 | |
Oneida | Malad City | 1864 | |
Owyhee | Murphy | 1863 | |
Payette | Payette | 1917 | |
Power | American Falls | 1913 | |
Shoshone | Wallace | 1861/1864 | |
Teton | Driggs | 1915 | |
Twin Falls | Twin Falls | 1907 | |
Valley | Cascade | 1917 | |
Washington | Weiser | 1879 |