Idaho County Creation Dates and Parent CountiesEdit This Page

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

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  • This page was last modified on 13 August 2014, at 15:11.
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