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 |
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