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Lassen County, California
Genealogy, History & Facts

Lassen County, California Facts

Lassen County

Lassen County was established on April 1, 1864 from Shasta County and Plumas County. The counties name was derived from Mount Lassen, which was named in honor of Peter Lassen.  He was a Danish immigrant who settled in Plumas County before coming to the Honey Lake Valley around 1855.  He had a small mill in the area, but mainly looked for gold.  He was killed in 1859 out in the Black Rock Desert.  It has never been determined who killed him.  He also had a ranch down toward Lassen Peak before coming here.

The County Seat is located in Susanville and the county government website is

Areas adjacent to Lassen County are Sierra County, Plumas County, Shasta County, Modoc County, Washoe County, Nevada.

Lassen County, CA Vital Records

Where can find Lassen County Birth, marriage, Divorce and Death Records?
Lassen 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 Lassen 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, 220 S. Lassen Street, Suite 5, Susanville, CA 96130; Office (530) 251-8234

Lassen County, CA Census Records

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

Lassen Co. Mortality Schedules can be found for 1870 and 1880. Lassen Co. Industry and Agriculture can be obtained for 1870 and 1880. Lassen 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.

Lassen County, CA Courthouse and Government Records

Lassen County Courthouse

What genealogical records can I find in the Lassen County Courthouse?
The below facts shows exactly what death, marriage, birth, property, wills, and court records are typically in Lassen 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 Lassen County Courthouse
  • Lassen County Courthouse (all departments listed below are located here, unless otherwise noted)
  • Lassen 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.
    • Birth / Death Records: 1864
    • Marriage Records: 1864
    • Land Records: 1857
  • Lassen 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: 1864 
    • Court Records: 1863 
  • Early California Wills
  • BLM Land Records

Lassen County, CA Societies and Family History Resources

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

  • Lassen County Historical Society, PO Box 321, Susanville, CA 96130; 530-257-2996
  • Lassen Historical Museum, 105 N. Weatherlow Street, P.O. Box 321, Susanville, CA 96130; Phone (530) 257-4584; Hours: May-Sep, 10-4, Mon-Fri; other times by appointment; About: “We are a regional historical society connected with the Lassen County Historical Society. Historical items related to Lassen County with permanent and special exhibitions. Facilities include a stamp mill. Publications include books, a quarterly journal, and a monthly newsletter.”
  • California State Archives, Office of Secretary of State, 1020 O Street, Room 130, Sacramento, CA 95814
  • California State Library, 914 Capitol Mall, Sacramento, CA 95814
  • California Historical Society, 678 Mission Street, San Francisco 94105
  • California Genealogical Society And Library, 2201 Broadway, Suite LL2, Oakland 94612-3017

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

What other genealogical resources are available in Lassen County, CA?
The following are web links to Genealogy, Records and Resources pertaining to Lassen 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.

Lassen Co. CA Books, Newspapers & Publications

Lassen Co. CA Cemeteries & Church Records

Lassen Co. CA Family Websites, Pictures & Histories

Lassen Co. CA General and History Websites

Lassen Co. CA Maps, Atlases & Gazetteers

Lassen Co. CA Military Records

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