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List of California Counties and County Seats





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The U.S. state of California is divided into 58 counties. Explore list of California Counties and their County Seats in alphabetical order populations, areas and the date of formation.

List of California Counties and County Seat

CountyCounty SeatPopulation (2011)Area Formed
Alameda CountyOakland1638215738 sq mi1853
Alpine CountyMarkleeville1110739 sq mi1864
Amador CountyJackson37001606 sq mi1854
Butte CountyOroville2254111,640 sq mi1850
Calaveras CountySan Andreas448281,020 sq mi1850
City and County of San FranciscoSan Francisco86481647 sq mi1850
Colusa CountyColusa214821,151 sq mi1850
Contra Costa CountyMartinez1126745720 sq mi1850
Del Norte CountyCrescent City272541,008 sq mi1857
El Dorado CountyPlacerville1844521,712 sq mi1850
Fresno CountyFresno9748615,963 sq mi1856
Glenn CountyWillows280171,315 sq mi1891
Humboldt CountyEureka1357273,573 sq mi1853
Imperial CountyEl Centro1801914,175 sq mi1907
Inyo CountyIndependence1826010,192 sq mi1866
Kern CountyBakersfield8821768,142 sq mi1866
Kings CountyHanford1509651,390 sq mi1893
Lake CountyLakeport645911,258 sq mi1861
Lassen CountySusanville313454,558 sq mi1864
Los Angeles CountyLos Angeles101702924,060 sq mi1850
Madera CountyMadera1549982,138 sq mi1893
Marin CountySan Rafael261221520 sq mi1850
Mariposa CountyMariposa175311,451 sq mi1850
Mendocino CountyUkiah876493,509 sq mi1850
Merced CountyMerced2684551,929 sq mi1855
Modoc CountyAlturas89653,944 sq mi1874
Mono CountyBridgeport139093,044 sq mi1861
Monterey CountySalinas4338983,322 sq mi1850
Napa CountyNapa142456754 sq mi1850
Nevada CountyNevada City98877958 sq mi1851
Orange CountySanta Ana3169776790 sq mi1889
Placer CountyAuburn3753911,503 sq mi1851
Plumas CountyQuincy184092,554 sq mi1854
Riverside CountyRiverside23610267,208 sq mi1893
Sacramento CountySacramento1501335966 sq mi1850
San Benito CountyHollister587921,389 sq mi1874
San Bernardino CountySan Bernardino212813320,062 sq mi1853
San Diego CountySan Diego32995214,204 sq mi1850
San Joaquin CountyStockton7261061,399 sq mi1850
San Luis Obispo CountySan Luis Obispo2814013,304 sq mi1850
San Mateo CountyRedwood City765135449 sq mi1856
Santa Barbara CountySanta Barbara4447692,738 sq mi1850
Santa Clara CountySan Jose19180441,291 sq mi1850
Santa Cruz CountySanta Cruz274146446 sq mi1850
Shasta CountyRedding1795333,786 sq mi1850
Sierra CountyDownieville2967953 sq mi1852
Siskiyou CountyYreka435546,287 sq mi1852
Solano CountyFairfield436092828 sq mi1850
Sonoma CountySanta Rosa5021461,576 sq mi1850
Stanislaus CountyModesto5383881,495 sq mi1854
Sutter CountyYuba City96463603 sq mi1850
Tehama CountyRed Bluff633082,951 sq mi1856
Trinity CountyWeaverville130693,179 sq mi1850
Tulare CountyVisalia4598634,824 sq mi1852
Tuolumne CountySonora537092,236 sq mi1850
Ventura CountyVentura8505361,846 sq mi1872
Yolo CountyWoodland2130161,012 sq mi1850
Yuba CountyMarysville74492630 sq mi1850