California County Creation Dates and Parent CountiesEdit This Page

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Name of County Date Formed Parent County Progeny County
Alameda 25 Mar 1853 Contra Costa, Santa Clara none
Alpine 16 Mar 1864 Eldorado, Calaveras, Amador none
Amador 1 May 1854
 Calaveras Alpine 1864
Branciforte 18 Feb 1850 California Lands renamed Santa Cruz
Butte 18 Feb 1850 Calfornia Lands Plumas 1854, Tehama 1856
Calaveras 18 Feb 1850 California Lands Alpine 1864, Amador 1854, Mono 1861
Colusa 18 Feb 1850 California Lands Glen 1891, Tehama 1856
Contra Costa 18 Feb 1850 California Lands Alameda 1853
Del Norte 2 Mar 1857 Humboldt none
El Dorado 18 Feb 1850 California Lands Alpine 1864
Fresno 19 Apr 1856 Marced, Mariposa Kings 1893, Madra 1893, Mono 1861
Humboldt 12 May 1853
 California Lands Del Norte 1857
Imperial 6 Aug 1907 San Diego none
Inyo 22 Mar 1866 Tulare none
Kern 2 Apr 1866 Tulare, Los Angeles none
Kings 22 Mar 1893 Fresno, Tulare none
Klamath 18 Feb 1850 California Lands renamed Siskiyou 1852
Lake 20 May 1861
 Tuolumne none
Lassen 1 Apr 1864 Plumas, Shasta none
Los Angeles 18 Feb 1850 California Lands Kern 1866, Orange 1889, San Bernardino 1853
Madera 11 Mar 1893 Fresno none
Marin 18 Feb 1850 California Lands none
Mariposa 18 Feb 1850 California Lands Fresno 1856, Merced 1855, Tulare 1852
Mendocino 18 Feb1 850 California Lands none
Merced 19 Apr 1855 Mariposa Fresno 1856
Modoc 17 Feb1 874 Siskiyou none
Mono 24 Apr 1861 Calaveras, Fresno none
Monterey 18 Feb 1850 California Lands San Benito 1874
Napa 18 Feb 1850 California Lands none
Nevada 25 Apr 1851 Yuba none
Orange 11 Mar 1889 Los Angeles none
Placer 25 Apr 1851 Yuba, Sutter none
Plumas 18 Mar 1854 Butte Lassen 1864
Riverside 11 Mar 1893 San Diego, San Bernardino none
Sacramento 18 Feb 1850 California Lands none
San Benito 12 Feb 1874 Monterey none
San Bernardino 26 Apr 1853 Los Angeles Riverside 1893
San Diego 18 Feb 1850 California Lands Imperial 1907, Riverside 1893
San Francisco 18 Feb 1850 California Lands San Mateo 1856
San Joaquin 18 Feb 1850 California Lands none
San Luis Obispo 18 Feb 1850 California Lands none
San Mateo 18 Feb 1856 San Francisco none
Santa Barbara 18 Feb 1850 California Lands none
Santa Clara 18 Feb 1850 California Lands none
Santa Cruz 19 Apr 1850 renamed from Branciforte none
Shasta 18 Feb 1850 California Lands Lassen 1864, Siskiyou 1852, Tehama 1856
Sierra 16 Feb 1852 Yuba none
Siskiyou 22 Mar 1852 renamed from Klamath none
Solano 18 Feb 1850 California Lands none
Sonoma 18 Feb1 850 California Lands none
Stanislaus 1 Apr 1854 Tuolumne none
Sutter 18 Feb 1850 California Lands Placer 1851
Tehama 9 Apr 1856 Colusa, Butte, Shasta none
Trinity 18 Feb 1850 California Lands none
Tulare 20 Apr 1852 Mariposa Inyo 1866, Kern 1866, Kings 1893
Tuolumne 18 Feb 1850 California Lands Lake 1861, Stanislaus 1854
Ventura 22 Mar 1872 Santa Barbara none
Yolo 18 Feb 1850 California Lands none
Yuba 18 Feb 1850 California Lands Nevada 1851, Placer 1851, Sierra 1852
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  • This page was last modified on 13 March 2009, at 04:26.
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