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Contra Costa County, California
Genealogy, History & Facts

Contra Costa County, California Facts

Contra Costa County

When was Contra Costa County, CA Created?
Contra Costa County was established on February 18, 1850 as one of the original 27 counties . This county name signifies “opposite coast,” because of its situation opposite San Francisco, in an easterly direction, on San Francisco Bay. In 1853, Alameda County was formed from territory originally included in this county.

What is the County Seat of Contra Costa County, CA?
The County Seat is located in Martinez also, the county government website is

What counties are adjacent to Contra Costa County, CA?
Bordering Counties are Alameda County (south), Marin County (west), Solano County (north), Sacramento County (northeast), San Joaquin County (east), San Francisco County (southwest) .

What cities and towns are in Contra Costa County, CA?
Cities and towns located in the County include El Cerrito, Hercules, Pinole, Richmond, San Pablo, Clayton, Concord, Danville, Lafayette, Martinez, Moraga, Orinda, Pleasant Hill, San Ramon, Walnut Creek, Antioch, Brentwood, Oakley, Pittsburg .

Contra Costa County, CA Vital Records

Where can find Contra Costa County Birth, marriage, Divorce and Death Records?
Contra Costa County vital records can be found at the California Office of Vital Records has copies of birth and death records from July 1905, marriage records that occurred from 1949-1986 and 1998-1999, divorce records that occurred between 1962 and June, 1984. There is a fee for each copy requested. Please refer to the information to the Statewide Vital Records in California for current fees and application process.

You can search online for Contra Costa County Birth, Marriage, Divorce or Death Records. You can also Order Electronically Online or can download an application for California Birth Certificate, Marriage or Divorce Certificate, Death Certificate Applications to mail.

Vital Records can also be found in the Local Registrar of Births and Death, 10 Douglas Drive, Suite 220, Martinez, CA 94553; Office (925) 313-1125

Contra Costa County, CA Census Records

What Contra Costa County, CA census records are available?
There are many types of census records for Contra Costa County guide you in researching your family tree. Federal Population Schedules are available for 1850, 1860, 1870, 1880 (free index), 1890 (fragment), 1900, 1910, 1920, 1930, 1940.

Contra Costa Co. Mortality Schedules can be found for 1850, 1860, 1870 and 1880. Contra Costa Co. Industry and Agriculture can be obtained for 1850, 1860, 1870 and 1880. Contra Costa Co. Union Veterans Schedules is available for 1890.

Another California census is the California State Census in 1852. One can find free online and printable census forms to help you with your research. See Also California Census Records Research Guide.

Contra Costa County, CA Courthouse and Government Records

ContraCosta County Courthouse

What genealogical records can I find in the Contra Costa County Courthouse?
The below facts shows exactly what death, marriage, birth, property, wills, and court records are typically in Contra Costa County. The years listed below are the first noted records with this county. 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. See Also California Corthouse Records Research Guide.

Old Contra Costa County Courthouse
  • Contra Costa County Courthouse (Completed 1931, all departments listed below are located here, unless otherwise noted)
  • Contra Costa County Recorder-Clerk is s responsible for examination and recording of all documents presented for recording that deal with establishing ownership of land in the County or as required by statute; administers the real property transfer tax law and maintains a permanent record and indexes of all documents for public viewing plus providing certified copies requested by the public; recording of all lawful documents such as deeds, deeds of trust, judgments, liens, affidavits, Uniform Commercial Code Financial Statements, etc; and the filing of Births, Deaths, and Marriages.
    • Address: 555 Escobar St. , Martinez, CA 94553
    • Phone: (925) 335-7900
    • Birth / Death Records: 1850
    • Marriage Records: 1850
    • Land Records: 1850
  • Contra Costa County Clerk of Superior Court has probate books and files from the county's superior court, civil court records, and naturalizations. Divorces may be here or in the Recorders Office, depending on how it was filed.
    • Probate Records: 1850 
    • Court Records: 1850 
  • Early California Wills
  • BLM Land Records

Contra Costa County, CA Societies and Family History Resources

What genealogical and historical societies, archives, museums, associations and libraries are available for Contra Costa County, CA?
A list of Contra Costa County Historical  and Genealogical Societies, Libraries, Archives. See also list of Statewide Californiia Archives, Historical & Genealogical Societies.

Where can I connect with other Contra Costa County, CA Researchers through message boards and forums?

What other genealogical resources are available in Contra Costa County, CA?
The following are web links to Genealogy, Records and Resources pertaining to Contra Costa County. A majority of these genealogy links fall into 3 categories: Business Sites, Private Sites or Organization Sites. Some have free access some require a payment. This is basically a listing which has been gathered or submitted. I do not recommend or promote one genealogy site above another.

Contra Costa Co. CA Books, Newspapers & Publications

Contra Costa Co. CA Cemeteries & Church Records

Contra Costa Co. CA Family Websites, Pictures & Histories

Contra Costa Co. CA General and History Websites

Contra Costa Co. CA Maps, Atlases & Gazetteers

Contra Costa Co. CA Military Records

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