California - County Formations

County Year Organized Parent County County Seat
Alameda1853Contra Costa and Santa ClaraOakland
Alpine1864Amador, Calaveras and El DoradoMarkleeville
Amador1854CalaverasJackson
Butte1850Original CountyOroville
Calaveras1850Original CountySan Andreas
Colusa1850Original CountyColusa
Contra Costa1850Original CountyMartinez
Del Norte1857KlamathCrescent City
El Dorado1850Original CountyPlacerville
Fresno1856Mariposa and MercedFresno
Glenn1891ColusaWillows
Humboldt1853TrinityEureka
Imperial1907San DiegoEl Centro
Inyo1866TulareIndependence
Kern1866Los Angeles and TulareBakersfield
Kings1893Fresno and TulareHanford
Klamath1851Trinity (25 April 1851 -- 28 May 1874)No Longer Exists
Lake1861NapaLakeport
Lassen1864Plumas and ShastaSusanville
Los Angeles1850Original CountyLos Angeles
Madera1893Fresno and MariposaMadera
Marin1850Original CountySan Rafael
Mariposa1850Original CountyMariposa
Mendocino1850Original CountyUkiah
Merced1855MariposaMerced
Modoc1874SiskiyouAlturas
Mono1861Calaveras and FresnoBridgeport
Monterey1850Original CountySalinas
Napa1850Original CountyNapa
Nevada1851YubaNevada City
Orange1889Los AngelesSanta Ana
Placer1851Sitter and YubaAuburn
Plumas1854ButteQuincy
Riverside1893San Bernardino and San DiegoRiverside
Sacramento1850Original CountySacramento
San Benito1874MontereyHollister
San Bernardino1853Los AngelesSan Bernardino
San Diego1850Original CountySan Diego
San Francisco1850Original CountySan Francisco
San Joaquin1850Original CountyStockton
San Luis Obispo1850Original CountySan Luis Obispo
San Mateo1856San FranciscoRedwood City
Santa Barbara1850Original CountySanta Barbara
Santa Clara1850Original CountySan Jose
Santa Cruz1850Original CountySanta Cruz
Shasta1850Original CountyRedding
Sierra1852YubaDownieville
Siskiyou1852Klamath, Oregon and ShastaYreka
Solano1850Original CountyFairfield
Sonoma1850Original CountySanta Rosa
Stanislaus1854TuolumneModesto
Sutter1850Original CountyYuba City
Tehama1856Butte, Colusa and ShastaRed Bluff
Trinity1850Original CountyWeaverville
Tulare1852MariposaVisalia
Tuolumne1850Original CountySonora
Ventura1872Santa BarbaraVentura
Yolo1850Original CountyWoodland
Yuba1850Original CountyMarysville



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