California County Official Web Sites


County Date
Formed
Parent County County Seat
Alameda 1853 Contra Costa, Santa Clara Oakland
Alpine 1864 Eldorado, Amador, Calaveras Markleeville
Amador 1854 Calaveras Jackson
Butte 1850 Original County Oroville
Calaveras 1850 Original County San Andreas
Colusa 1850 Original County Colusa
Contra Costa 1850 Original County Martinez
Del Norte 1857 Klamath Crescent City
El Dorado 1850 Original County Placerville
Fresno 1856 Merced, Mariposa Fresno
Glenn 1891 Colusa Willows
Humboldt 1853 Trinity Eureka
Imperial 1907 San Diego El Centro
Inyo 1866 Tulare Independence
Kern 1866 Tulare, Los Angeles Bakersfield
Kings 1893 Tulare, Fresno Hanford
Klamath 1851 Trinity No Longer Exists
Lake 1861 Napa Lakeport
Lassen 1864 Plumas, Shasta Susanville
Los Angeles 1850 Original County Los Angeles
Madera 1893 Mariposa, Fresno Madera
Marin 1850 Original County San Rafael
Mariposa 1850 Original County Mariposa
Mendocino 1850 Original County Ukiah
Merced 1855 Mariposa Merced
Modoc 1874 Siskiyou Alturas
Mono 1861 Calaveras, Fresno Bridgeport
Monterey 1850 Original County Salinas
Napa 1850 Original County Napa
Nevada 1851 Yuba Nevada City
Orange 1889 Los Angeles Santa Ana
Placer 1851 Yuba, Sutter Auburn
Plumas 1854 Butte Quincy
Riverside 1893 San Diego, San Bernardino Riverside
Sacramento 1850 Original County Sacramento
San Benito 1874 Monterey Hollister
San Bernardino 1853 Los Angeles San Bernardino
San Diego 1850 Original County San Diego
San Francisco 1850 Original County San Francisco
San Joaquin 1850 Original County Stockton
San Luis Obispo 1850 Original County San Luis Obispo
San Mateo 1856 San Francisco Redwood City
Santa Barbara 1850 Original County Santa Barbara
Santa Clara 1850 Original County San Jose
Santa Cruz 1850 Original County Santa Cruz
Shasta 1850 Original County Redding
Sierra 1852 Yuba Downieville
Siskiyou 1852 Shasta, Klamath, Oregon Yreka
Solano 1850 Original County Fairfield
Sonoma 1850 Original County Santa Rosa
Stanislaus 1854 Tuolumne Modesto
Sutter 1850 Original County Yuba City
Tehama 1856 Colusa, Butte, Shasta Red Bluff
Trinity 1850 Original County Weaverville
Tulare 1852 Mariposa Visalia
Tuolumne 1850 Original County Sonora
Ventura 1872 Santa Barbara Ventura
Yolo 1850 Original County Woodland
Yuba 1850 Original County Marysville


Map of California Counties

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