Idaho

Idaho has 44 Counties.

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Idaho Association of Counties
PO BOX 1623
Boise, ID 83701-1623
Phone: (208)345-9126
Fax: (208)345-0379
http://www.idcounties.org/

County NACo
Member
2010
Population
Square
Miles
County Seat Board
Size
Founded
Ada 392,365 1,053 Boise   1864 
Adams 3,976 1,363 Council   1911 
Bannock 82,839 1,112 Pocatello   1893 
Bear Lake 5,986 975 Paris   1893 
Benewah 9,285 777 Saint Maries   1915 
Bingham 45,607 2,094 Blackfoot   1885 
Blaine 21,376 2,644 Hailey   1895 
Boise 7,028 1,899 Idaho City   1907 
Bonner 40,877 1,735 Sandpoint   1907 
Bonneville 104,234 1,866 Idaho Falls   1911 
Boundary 10,972 1,269 Bonners Ferry   1915 
Butte 2,891 2,232 Arco   1917 
Camas 1,117 1,074 Fairfield   1917 
Canyon 188,923 587 Caldwell   1892 
Caribou 6,963 1,764 Soda Springs   1919 
Cassia 22,952 2,565 Burley   1879 
Clark 982 1,764 Dubois   1919 
Clearwater 8,761 2,457 Orofino   1911 
Custer 4,368 4,921 Challis   1881 
Elmore 27,038 3,075 Mountain Home   1889 
Franklin 12,786 664 Preston   1913 
Fremont 13,242 1,864 Saint Anthony   1893 
Gem 16,719 561 Emmett   1915 
Gooding 15,464 729 Gooding   1913 
Idaho 16,267 8,477 Grangeville   1864 
Jefferson 26,140 1,094 Rigby   1913 
Jerome 22,374 597 Jerome   1919 
Kootenai 138,494 1,244 Coeur d Alene   1864 
Latah 37,244 1,076 Moscow   1888 
Lemhi 7,936 4,563 Salmon   1869 
Lewis 3,821 479 Nezperce   1911 
Lincoln 5,208 1,201 Shoshone   1895 
Madison 37,536 469 Rexburg   1913 
Minidoka 20,069 758 Rupert   1913 
Nez Perce 39,265 848 Lewiston   1864 
Oneida 4,286 1,200 Malad City   1864 
Owyhee 11,526 7,666 Murphy   1863 
Payette 22,623 407 Payette   1917 
Power 7,817 1,404 American Falls   1913 
Shoshone 12,765 2,630 Wallace   1864 
Teton 10,170 449 Driggs   1915 
Twin Falls 77,230 1,921 Twin Falls   1907 
Valley 9,862 3,665 Cascade   1917 
Washington 10,198 1,453 Weiser   1879