California Naturalization Records Online at Ancestry
(these require an Ancestry subscription)
- California Federal Naturalization Records, 1888-1991 (requires payment) for naturalizations done in federal courts; includes digitized images of the naturalization records from the Riverside (Southern California), Los Angeles (Central California), and San Bruno (Northern California) branches of the National Archives; coverage varies by court; most records are Petitions for Naturalization or Declarations of Intention.
- California, State Court Naturalization Records, 1850-1986 (most are before 1930) (requires payment) includes index and images of naturalization records from California courts in Amador, Butte, Colusa, El Dorado, Fresno, Napa, Orange, Placer, Santa Barbara, Santa Clara, Sonoma, Stanislaus, Sutter, Yolo, and Yuba counties; coverage varies by county.
California Naturalization Records and Indexes Online at FamilySearch (free)
- California: County Naturalizations, 1849-1985 from FamilySearch; for Alameda, Amador, Alpine, Butte, Calaveras, Clousa, El Dorado, Fresno, Glenn, Lake, Lassen, Los Angeles, Mendocino, Napa, Nevada, Orange, Placer, Sacramento, San Francisco, Sonoma, Santa Clara, Stanislaus, Santa Barbara, San Benito, San Diego, Solano, Sutter, Yolo, and Yuba counties. Coverage varies by county.
- California, Northern U.S. District Court Naturalization Index, 1852-1989 from National Archives microfilm publication M1744
- California, Southern District Court (Central) Naturalization Index, 1915-1976 from National Archives microfilm publication M1525
County Listings
- Contra Costa County Naturalization Records Index
- Madera County Naturalization Records has 20th Century (1907 and later) Declarations of Intent and Petitions for Citizenship (some gaps)
- Marin County: Index of Naturalized Citizens, 1856-1934 PDF
- Mariposa County Naturalizations Index, 1854-1906
- Orange County Index to Naturalization Records, 1889-1944; and Assorted Naturalization Records, 1889-1929 digitized microfilm from FamilySearch
- San Luis Obispo County Naturalization Records Index PDFs
- San Mateo County Naturalization Records Indexes PDFs
- Santa Barbara County Naturalizations Index
- Santa Clara County Naturalization Index, 1850-1934
- Shasta County, California Naturalization Records, 1852-1932 (requires payment - part of an Ancestry subscription)
- Sonoma County: Index to Naturalization Records in Sonoma County, California, 1841-1906
- Tulare County Naturalization Index
- Ventura County Naturalization Records Indexes, 1873-1914 from the Ventura County Genealogical Society (coverage varies by type of naturalization document)
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