| 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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