County County Seat Date Formed Original County Coordinator
Ada Boise  State Capitol December 22, 1864 Boise  
Adams Council March 3, 1911 Washington  
Alturas (defunct) 1864-1895 Original County Judy White
Bannock Pocatello March 6, 1893 Bingham Judy White
Bear Lake Paris January 5, 1875 Oneida  
Benewah St. Maries January 23, 1915 Kootenai  
Bingham Blackfoot January 13, 1885 Oneida  
Blaine Hailey March 5, 1895 Alturas Judy White
Boise Idaho City February 4, 1864 Original County  
Bonner Sandpoint February 21, 1907 Kootenai Judy White
Bonneville Idaho Falls February 7, 1911 Bingham  
Boundary Bonners Ferry January 23, 1915 Bonner  
Butte Arco February 6, 1917 Bingham, Blaine, Jefferson  
Camas Fairfield February 6, 1917 Blaine Chris Storey
Canyon
Caldwell March 7, 1891 Ada  
Caribou Soda Springs February 11, 1919 Bannock  
Cassia Burley February 29, 1879 Owyhee Chris Storey
Clark Dubois February 1, 1919 Fremont Michael G. Shaw
Clearwater Orofino February 27, 1911 Nez Perce  
Custer Challis January 8, 1881 Alturas and Lemhi  
Elmore Mountain Home February 7, 1889 Alturas  
Franklin Preston January 20, 1913 Oneida  
Fremont
St. Anthony March 4, 1893 Bingham  
Gem County Emmett March 15, 1915 Boise and Canyon Sharon McConnel
Gooding County Gooding January 28, 1913 Lincoln  
Idaho Grangeville February 4, 1864 Original County  
Jefferson Rigby February 18, 1913 Fremont  
Jerome Jerome February 8, 1919 Gooding and Lincoln Chris Storey
Kootenai Coeur d'Alene December 22, 1864 Nez Perce Judy White
Latah Moscow May 14, 1888 Nez Perce  
Lemhi Salmon January 9, 1869 Idaho  
Lewis Nez Perce March 30, 1911  
Lincoln Shoshone March 18, 1913 Alturas and Blaine Chris Storey
Rexburg February 18, 1913 Fremont  
Minidoka Rupert January 26, 1913 Lincoln Chris Storey
Nez Perce County Lewiston February 4, 1864 Original County Judy White
Oneida Malad January 22, 1864 Original County  
Owyhee Murphy December 31, 1863 Original County  
Payette Payette February 28, 1917 Canyon Kerrie Taylor
Power American Falls January 30, 1913 Bingham, Blaine, Oneida  
Shoshone Wallace February 4, 1864 Original County  
Teton Driggs January 26, 1915 Madison  
Twin Falls Twin Falls February 21, 1907 Cassia Chris Storey
Valley Cascade February 26, 1907 Idaho and Boise Sharon McConnel
Washington Weiser February 20, 1879 Boise  


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Maps -
1895 Atlas
Idaho State University Digital Atlas
Idaho Geological Survey
USGS index of Geographic Names



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