Idaho County Creation Dates and Parent CountiesEdit This Page

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Name of County Date Formed Parent County Progeny County
Ada 22 Dec 1864 Boise Canyon 1891, Elmore 1889
Adams 03 Mar 1911 Washington none
Alturas 04 Feb 1863 Idaho Territory Blaine 1895, Custer 1881, Elmore 1889, Lincoln 1895
Bannock 06 Mar 1839 Oneida, Bear Lake Caribou 1919
Bear Lake 05 Jan 1875 Oneida Bannock 1893
Benewah 25 Jan 1915 Kootenai none
Bingham 13 Jan 1885 Oneida Bonneville 1911, Butte 1917, Power 1913, Fremont 1893, Teton 1915
Blaine 05 Mar 1895 Alturas Butte 1917, Camas 1917, Power 1913
Boise 12 Jan 1863 Idaho Territory Ada 1864, Gem 1915, Valley 1917, Washington 1879
Bonner 21 Feb 1907 Kootenai Boundary 1915
Bonneville 07 Feb 1911 Bingham none
Boundary 23 Jan 1915 Bonner none
Butte 06 Feb 1917 Bingham, Blaine, Jefferson none
Camas 06 Feb 1917 Blaine none
Canyon 07 Mar 1891 Owyhee, Ada Gem 1915, Payette 1917
Cassia 20 Feb 1879 Oneida Twin Falls 1907
Clark 01 Feb 1919 Fremont none
Clearwater 27 Feb 1911 Nez Perce none
Custer 08 Jan 1881 Alturas none
Elmore 07 Feb 1889 Alturas, Ada none
Franklin 30 Jan 1913 Oneida none
Fremont 04 Mar 1893 Bingham, Lemhi Clark 1919, Jefferson 1913, Teton 1915, Madison 1913
Gem 19 Mar 1915 Boise, Canyon none
Gooding 28 Jan 1913 Lincoln Jerome 1919
Idaho  04 Feb 1864 Idaho Territory Lemhi 1869, Valley 1917
Jefferson 18 Feb 1913 Fremont Butte 1917
Jerome 08 Feb 1919 Gooding, Lincoln none
Kootenai 22 Dec 1864 Nez Perce Benewah 1915, Bonner 1907
Latah 22 Dec 1864 Nez Perce none
Lemhi 09 Jan 1869 Idaho Fremont 1893
Lewis 03 Mar 1911 Nez Perce none
Lincoln 18 Mar 1895 Alturas Gooding 1913, Jerome 1919, Minidoka 1913
Madison 18 Feb 1913 Fremont Teton 1915
Minidoka 28 Jan 1913 Lincoln none
Nez Perce 20 Dec 1861 Idaho Territory Clearwater 1911, Kootenai 1864, Latah 1864, Lewis 1911
Oneida 22 Jan 1864 Idaho Territory Bannock 1893, Bear Lake 1875, Bingham 1885, Caribou 1919, Cassia 1879, Franklin 1913, Power 1913
Owyhee 31 Dec 1863 Idaho Territory Canyon 1891
Payette 28 Feb 1917 Canyon none
Power 30 Jan 1913 Bingham, Blaine, Oneida none
Shoshone 04 Feb 1864 Idaho Territory none
Teton 26 Jan 1915 Madison, Fremont, Bingham none
Twin Falls 21 Feb 1907 Cassia none
Valley 26 Feb 1917 Boise, Idaho none
Washington 20 Feb 1879 Boise Adams 1911
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  • This page was last modified on 13 March 2009, at 04:29.
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