California County records can vary vastly from county to county both in quality and quantity. Some happen to have been carefully maintained while others have been substantially misused and overlooked. A certain amount of California records have simply disappeared. For genealogists carrying out research in California there’s no effective substitute to have an on-site search of county court house records. For Definitions of all court terms see the Genealogy Encyclopedia.
On January 4, 1850, the California constitutional committee recommended the formation of 18 counties. They were Benicia, Butte, Fremont, Los Angeles, Mariposa, Monterey, Mount Diablo, Oro, Redding, Sacramento, San Diego, San Francisco, San Joaquin, San Jose, San Luis Obispo, Santa Barbara, Sonoma, and Sutter.
California is divided into 58 counties. Each county serves as the local level of government within its borders. Counties are responsible for all elections, property-tax collection, maintenance of public records such as deeds, and local-level courts within their borders, as well as providing law enforcement (through the county sheriff and sheriff’s deputies) to areas that are not within incorporated cities. California State Government is located in Sacramento.
Some counties encompass land settled in the eighteenth century; their records pre-date county formation. Land transactions and vital records recorded in the county are at the county recorder’s office. The county clerk general has probate books and files from the county’s superior court, civil court records, and naturalizations. Divorces may be in either place, depending on how filed.
The links in the table below link to county and city government offices and is limited to government-maintained websites. If you know of a California county that has an official government web site but is not linked, or if the link is in error, please contact us so we may edit our database.
|County||Date Formed||Parent County||County Seat|
|Alameda||March 25, 1853||Contra Costa and Santa Clara Counties||Oakland|
|Alpine||March 16, 1864||Amador, El Dorado, Calaveras, Mono and Tuolumne Counties||Markleeville|
|Amador||May 11, 1854||Calaveras County||Jackson|
|Butte||February 18, 1850||Original County||Oroville|
|Calaveras||February 18, 1850||Original County||San Andreas|
|Colusa||February 18, 1850||Original County||Colusa|
|Contra Costa||February 18, 1850||Original County||Martinez|
|Del Norte||March 2, 1857||Klamath County||Crescent City|
|El Dorado||February 18, 1850||Original County||Placerville|
|Fresno||April 19, 1856||Mariposa, Merced and Tulare Counties||Fresno|
|Glenn||March 11, 1891||Colusa County||Willows|
|Humboldt||May 12, 1853||Trinity County||Eureka|
|Imperial||August 6, 1907||San Diego County||El Centro|
|Inyo||March 22, 1866||Mono and Tulare Counties||Independence|
|Kern||April 2, 1866||Los Angeles and Tulare Counties||Bakersfield|
|Kings||March 22, 1893||Tulare County||Hanford|
|Lake||May 20, 1861||Napa County||Lakeport|
|Lassen||April 1, 1864||Plumas and Shasta Counties, and now defunct Lake County, Nevada||Susanville|
|Los Angeles||February 18, 1850||Original County||Los Angeles|
|Madera||March 11, 1893||Mariposa County||Madera|
|Marin||February 18, 1850||Original County||San Rafael|
|Mariposa||February 18, 1850||Original County||Mariposa|
|Mendocino||February 18, 1850||Original County||Ukiah|
|Merced||April 19, 1855||Mariposa County||Merced|
|Modoc||April 19, 1855||Siskiyou County||Alturas|
|Mono||April 24, 1861||Calaveras, Fresno and Mariposa Counties||Bridgeport|
|Monterey||February 18, 1850||Original County||Salinas|
|Napa||February 18, 1850||Original County||Napa|
|Nevada||April 25, 1851||Yuba County||Nevada City|
|Orange||March 11, 1889||Los Angeles County||Santa Ana|
|Placer||April 25, 1851||Sutter and Yuba Counties||Auburn|
|Plumas||March 18, 1854||Butte County||Quincy|
|Riverside||March 11, 1893||San Bernardino and San Diego Counties||Riverside|
|Sacramento||February 18, 1850||Original County||Sacramento|
|San Benito||February 12, 1874||Monterey County||Hollister|
|San Bernardino||April 26, 1853||Los Angeles County||San Bernardino|
|San Diego||February 18, 1850||Original County||San Diego|
|San Francisco||February 18, 1850||Original County||San Francisco|
|San Joaquin||February 18, 1850||Original County||Stockton|
|San Luis Obispo||February 18, 1850||Original County||San Luis Obispo|
|San Mateo||April 19, 1856||San Francisco and Santa Cruz Counties||Redwood City|
|Santa Barbara||February 18, 1850||Original County||Santa Barbara|
|Santa Clara||February 18, 1850||Original County||San Jose|
|Santa Cruz||February 18, 1850||Original County||Santa Cruz|
|Shasta||February 18, 1850||Original County||Redding|
|Sierra||April 16, 1852||Yuba County||Downieville|
|Siskiyou||March 22, 1852||Shasta and Klamath Counties||Yreka|
|Solano||February 18, 1850||Original County||Fairfield|
|Sonoma||February 18, 1850||Original County||Santa Rosa|
|Stanislaus||April 1, 1854||Tuolumne County||Modesto|
|Sutter||February 18, 1850||Original County||Yuba City|
|Tehama||April 9, 1856||Butte, Colusa and Shasta Counties||Red Bluff|
|Trinity||February 18, 1850||Original County||Weaverville|
|Tulare||April 20, 1852||Mariposa County||Visalia|
|Tuolumne||February 18, 1850||Original County||Sonora|
|Ventura||March 22, 1872||Santa Barbara County||Ventura|
|Yolo||February 18, 1850||Original County||Woodland|
|Yuba||February 18, 1850||Original County||Marysville|
Interactive Map of California Counties Formation
California Extinct Counties
California seems to have counties that no longer exist. They were created by the state, provincial, or territorial authorities. A lot of these counties were established and disbanded in the Nineteenth century; county boundaries have adjusted very little since Nineteen hundred in the great most of states. These counties really should be investigated when doing genealogy research. Pay attention where the courthouse records went to if the county was eliminated or combined with some other county.
- Branciforte County was one of the original 27 counties adopted by statutes of 1850, but soon after that the legislature changed the name to Santa Cruz County.
- Coloma County was a county proposed by a committee of the California Constitutional Convention. Before the statute was adopted, the legislature changed the name to El Dorado County.
- Coso County was approved by the State Legislature which designated territory in Mono County and Tulare County to be in the new county with the county seat at Bend City. Coso County, however, was never organized. In 1866 substantially the same territory was created as Inyo County.
- Fremont County was a county proposed by a committee of the California Constitutional Convention. Before the statute was adopted, the legislature changed the name to Yola County and later changed the name to Yolo County.
- Klamath County was created on 1851 from the northern half of Trinity County. In 1857 Klamath County lost significant territory to the newly formed Del Norte County. In 1875 Klamath County was abolished and its territory was divided between Humboldt County and Siskiyou County. Territory which at one time was in Klamath County is now in Del Norte County, Humboldt County, Siskiyou County, and Trinity County.
- Mount Diablo County was a county proposed by a committee of the California Constitutional Convention. Before the statute was adopted, the legislature changed the name to Contra Costa County.
- Oro County was a county proposed by a committee of the California Constitutional Convention. Before the statute was adopted, the legislature changed the name to Tuolumne County.
- Pautah County was created on 1852, an act to be effective when the United States Congress ceded to the State of California the territory described, in what is now the State of Nevada. The County seat was to be Carsonville. California never acquired the territory and the act creating the county was repealed in 1859.
- Redding County was a county proposed by a committee of the California Constitutional Convention. Before the statute was adopted, the legislature changed the name to Shasta County.
California Counties with Burned Courthouses
The damage to California courthouses considerably has a bearing on genealogists in just about every way. Not only are these types of historic buildings torn from all of our lifetimes, so are the archives they stored: marriage, wills, probate, land records, among others. Once destroyed they’re destroyed permanently. Despite the fact that they have already been placed on mircofilm, computers and film burn as well. The most tragic aspect of this is the reason why almost all of our courthouses are destroyed as a result of arsonist. Although, not all the records were damaged or lost. Many California counties have experienced a loss of records due to courthouse fires, floods, and theft.
- Amador Co. Courthouse – Courthouse destroyed by fire in 1862. Some records were destroyed.
- Del Norte Co. Courthouse- The courthouse was destroyed by fire in 1948. Some early records were destroyed.
- El Dorado Co. Courthouse – A fire in 1910 & 1920 destroyed most courthouse records. For probate records prior to 1951, write County Nuseum, 100 Placerville
Drive, Placerville, California 95667; for probate after 1951, write to Judicial Section, 495 Main Street, Placerville,
- Inyo Co. Courthouse – was destroyed by an earthquake March 26, 1872. On June 30, 1886 a fire broke out in a vacant building in Independence and destroyed thirty-eight buildings. Although the county records and most of the furniture were saved, the courthouse was one of the buildings destroyed.
- Lake Co. Courthouse – courthouse in Lakeport burned down in 1867. All earlier records were destroyed.
- Madera Co. Courthouse – A fire on Christmas Eve 1906 destroyed the upper floors and tower.
- Nevada Co. Courthouse – The first courthouse was damaged by fire in 1856. Fire again damaged the courthouse in 1863.
- Sacramento Co. Courthouse- The first courthouse, built in 1851, became the Capitol in 1854 and was destroyed in a fire that same year.
- San Francisco Co. Courthouse – Courthouse and all records were destroyed in the great earthquake and fire of 1906.
- Santa Clara Co. Courthouse – May 18, 1931, a fire quickly spread through the courthouse, causing extensive damage.
- Shasta Co. Courthouse – All records were destroyed in the great fire of June 14th, 1853
- Sierra Co. Courthouse – Fire in 1947 destroyed courthouse. No records were lost
- Sonoma Co. Courthouse – was destroyed in the 1906 earthquake. Minor record Loss.
- Sutter Co. Courthouse – The Courthhouse was destroyed by fire in 1871. A second and larger courthouse, completed in 1873, was also set fire.