California 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
Alameda 1853 Mar 25 Details Contra Costa, Santa Clara none
Alpine 1864 Mar 16 Details Eldorado, Calaveras, Amador none
Amador 1854 May 1 Details Calaveras Alpine 1864
Branciforte 1850 Feb 18 Details California Lands renamed Santa Cruz
Butte 1850 Feb 18 Details Calfornia Lands Plumas 1854, Tehama 1856
Calaveras 1850 June 18 Details California Lands Alpine 1864, Amador 1854, Mono 1861
Colusa 1850 Feb 18 Details California Lands Glen 1891, Tehama 1856
Contra Costa 1850 Feb 18 Details California Lands Alameda 1853
Del Norte 1857 July 2 Details Humboldt none
El Dorado 1850 Feb 18 Details California Lands Alpine 1864
Fresno 1856 Apr 19 Details Marced, Mariposa Kings 1893, Madra 1893, Mono 1861
Humboldt
August 12
Details California Lands Del Norte 1857
Imperial 1907 ug 6 Details San Diego none
Inyo 1866 Mar 22 Details Tulare none
Kern 1866 September 2 Details Tulare, Los Angeles none
Kings 1893 Mar 22 Details Fresno, Tulare none
Klamath 1850 Feb 18 Details California Lands renamed Siskiyou 1852
Lake
October 20
Details Tuolumne none
Lassen 1864 pr 1 Details Plumas, Shasta none
Los Angeles 1850 Feb 18 Details California Lands Kern 1866, Orange 1889, San Bernardino 1853
Madera 1893 November 11 Details Fresno none
Marin 1850 Feb 18 Details California Lands none
Mariposa 1850 Feb 18 Details California Lands Fresno 1856, Merced 1855, Tulare 1852
Mendocino 850 December 18 Details California Lands none
Merced 1855 Apr 19 Details Mariposa Fresno 1856
Modoc 874 Feb 17 Details Siskiyou none
Mono 1861 January 24 Details Calaveras, Fresno none
Monterey 1850 Feb 18 Details California Lands San Benito 1874
Napa 1850 Feb 18 Details California Lands none
Nevada 1851 February 25 Details Yuba none
Orange 1889 Mar 11 Details Los Angeles none
Placer 1851 Apr 25 Details Yuba, Sutter none
Plumas 1854 March 18 Details Butte Lassen 1864
Riverside 1893 Mar 11 Details San Diego, San Bernardino none
Sacramento 1850 Feb 18 Details California Lands none
San Benito 1874 April 12 Details Monterey none
San Bernardino 1853 Apr 26 Details Los Angeles Riverside 1893
San Diego 1850 Feb 18 Details California Lands Imperial 1907, Riverside 1893
San Francisco 1850 May 18 Details California Lands San Mateo 1856
San Joaquin 1850 Feb 18 Details California Lands none
San Luis Obispo 1850 Feb 18 Details California Lands none
San Mateo 1856 June 18 Details San Francisco none
Santa Barbara 1850 Feb 18 Details California Lands none
Santa Clara 1850 Feb 18 Details California Lands none
Santa Cruz 1850 July 19 Details renamed from Branciforte none
Shasta 1850 Feb 18 Details California Lands Lassen 1864, Siskiyou 1852, Tehama 1856
Sierra 1852 Feb 16 Details Yuba none
Siskiyou 1852 August 22 Details renamed from Klamath none
Solano 1850 Feb 18 Details California Lands none
Sonoma 850 Feb 18 Details California Lands none
Stanislaus 1854 September 1 Details Tuolumne none
Sutter 1850 Feb 18 Details California Lands Placer 1851
Tehama 1856 pr 9 Details Colusa, Butte, Shasta none
Trinity 1850 October 18 Details California Lands none
Tulare 1852 Apr 20 Details Mariposa Inyo 1866, Kern 1866, Kings 1893
Tuolumne 1850 Feb 18 Details California Lands Lake 1861, Stanislaus 1854
Ventura 1872 November 22 Details Santa Barbara none
Yolo 1850 Feb 18 Details California Lands none
Yuba 1850 Feb 18 Details California Lands Nevada 1851, Placer 1851, Sierra 1852

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  • This page was last modified on 19 June 2014, at 18:32.
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