California Genealogy and History Archives
California County/County Seat
| County | County Seat |
| Alameda County | Oakland |
| Alpine County | Markleeville |
| Amador County | Jackson |
| Butte County | Oroville |
| Calaveras County | San Andreas |
| Colusa County | Colusa |
| Contra Costa County | Martinez |
| Del Norte County | Crescent City |
| El Dorado County | Placerville |
| Fresno County | Fresno |
| Glenn County | Willows |
| Humboldt County | Eureka |
| Imperial County | El Centro |
| Inyo County | Independence |
| Kern County | Bakersfield |
| Kings County | Hanford |
| Lake County | Lakeport |
| Lassen County | Susanville |
| Los Angeles County | Los Angeles |
| Madera County | Madera |
| Marin County | San Rafael |
| Mariposa County | Mariposa |
| Mendocino County | Ukiah |
| Merced County | Merced |
| Modoc County | Alturas |
| Mono County | Bridgeport |
| Monterey County | Salinas |
| Napa County | Napa |
| Nevada County | Nevada City |
| Orange County | Santa Ana |
| Placer County | Auburn |
| Plumas County | Quincy |
| Riverside County | Riverside |
| Sacramento County | Sacramento |
| San Benito County | Hollister |
| San Bernardino County | San Bernardino |
| San Diego County | San Diego |
| San Francisco County | San Francisco |
| San Joaquin County | Stockton |
| San Luis Obispo County | San Luis Obispo |
| San Mateo County | Redwood City |
| Santa Barbara County | Santa Barbara |
| Santa Clara County | San Jose |
| Santa Cruz County | Santa Cruz |
| Shasta County | Redding |
| Sierra County | Downieville |
| Siskiyou County | Yreka |
| Solano County | Fairfield |
| Sonoma County | Santa Rosa |
| Stanislaus County | Modesto |
| Sutter County | Yuba City |
| Tehama County | Red Bluff |
| Trinity County | Weaverville |
| Tulare County | Visalia |
| Tuolumne County | Sonora |
| Ventura County | Ventura |
| Yolo County | Woodland |
| Yuba County | Marysville |