The Ancestor Hunt regularly adds and updates new collection links, as well as searches for and fixes broken links.
(This page's most recent update is January 2025)
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Do you research naturalization records? No? Why not? Does the thought of going through paper files in dusty court basements turn you off? Well – I’m here to tell you that it is worth it – and with recent digitization efforts – more and more original documents have been scanned and made available via microfilm or online.
Some of the larger subscription sites have also made some source documents available – as well as index cards that can lead you to the court that handled the proceedings.
If you wish to get educated first about all of these documents and the naturalization process and how it has changed over time – please read these two terrific summaries:
- The U.S. Archives Naturalization Records
- FamilySearch’s Wiki entry United States Naturalization and Citizenship
- Women and Naturalization
Okay – now that you are educated and know that post-1906 – about 4 awesome documents just drip with great information: Declaration of Intent, Petition for Citizenship or Naturalization, Certificate of Arrival, and the Certificate of Naturalization. Many of the online genealogy websites may not have all of these documents available but do have index cards that are searchable – which have information regarding the court handling the proceedings. With this information, you might be able to track down some of the source documents.
Below is a list of links to free online naturalization record and index collections for the state:
Note: Some links listed take you to a FamilySearch Collection of digital images. Near the bottom of the page under Film/Digital Notes is the name of each sub-collection. If there is a camera icon at the right of the name (in the Format column) then the collections’ images are browsable. If there is a camera with a key icon, it is only available at a Family History Center or affiliated library. If there is a film reel icon, then it is only available in microfilm format, not digital. To take full advantage make sure that you are logged in to FamilySearch. The results may be different if you are signed in, rather than not.
California Naturalization Records
- Alameda County Naturalization Records, 1853-1990
- Alameda County Naturalization Records, 1880-1931; and Index, 1853-1985
- Alpine County Great Registers, 1866-1910; Indexes, 1908-1920
- Alpine County Naturalizations, 1867-1903
- Alpine County Naturalizations, 1904-1947; Indexes 1880-1916
- Amador County, Naturalization Records, 1870-1943; Indexes 1864-1944
- Butte County Declaration of Intention to Become a Citizen, Index, 1849-1880
- Butte County Naturalizations, 1850-1930
- Butte County, Great Register, uncanceled Entries, 1884
- Calaveras County Great Register, 1890
- Calaveras County Great Registers, 1896-1909
- Calaveras County Declarations of Intention, 1850-1929; Naturalization Records and Index, 1850-1950; Naturalization Petitions and Records, 1930-1959; Certificates of Naturalization, 1907-1916
- California Counties Naturalization Record Indexes
- California County Naturalizations, 1831-1985
- California Great Registers, 1866-1910
- California State Library, Vital Statistics Index, ca. 1800s-1920
- California, Court deposited Declarations of Intention from out-of-state, 1846-1903
- California, Northern U.S. District Court Naturalization Index, 1852-1989
- California, San Diego Naturalization Index, 1868-1958
- California, Southern District Court (Central) Naturalization Index, 1915-1976
- California, Selected Indexes to Naturalization Records 1852-1928
- Colusa County Naturalizations, 1851-1957
- Contra Costa County History Center Naturalization Records Search
- Del Norte County, Index to the Great Register of 1890
- El Dorado County Naturalization Records, 1883-1903; and Indexes, 1852-1938, 1850 to 1986
- Fresno County Great Registers, 1866-1906
- Fresno County Naturalizations, 1875-1934
- Fresno County Petition for Naturalization and Declaration of Intention for Citizenship Papers: 1862-1927
- Glenn County Naturalization Records, 1891-1929
- Glenn County Superior Court Minute Books, 1891-1923
- Great Register of the County of Stanislaus, State of California, 1890
- Imperial County, Calexico, Manifests of Alien Arrivals, 1907-1952
- Kern County Great Register
- Kings County Immigration and Naturalization, 1893-1952
- Lake County Great Registers, 1867-1894
- Lake County Naturalizations, 1882-1929
- Lassen County Great Registers, 1866-1890, 1892-1894, 1896-1901
- Lassen County Naturalizations, 1865-1935; Index 1865-1906
- Los Angeles County Naturalization Records 1876-1915; Naturalization Index 1852-1915
- Madera County Declarations of Intent (documents)
- Madera County Petitions for Naturalization Index
- Marin County Naturalized Citizens Index 1856-1934
- Mariposa County Naturalized Citizens Index 1854-1906
- Mendocino County Naturalization Records, 1848-1928; Indexes, 1858-ca. 1990
- Merced County Great Register of Merced County, 1892
- Napa County Great Register 1880 – 1894
- Napa County, Naturalization Records, 1856-1936; Indexes to Declarations of Intention, and Naturalizations, 1856-1939
- Nevada County Naturalization, Card Index, 1856-1950
- Nevada County, Great Registers, 1892-1908
- Orange County Naturalization Records, 1889-1944
- Placer County Naturalizations, 1852-1929
- Placer County, Naturalization Indexes, ca. 1850-1980
- Sacramento County Great Register Index, 1890
- Sacramento County Naturalization Records, 1859-1906; Indexes, 1850-1955
- San Benito County Decrees of the District and Superior Courts, 1874-1908
- San Benito County Miscellaneous Coroner’s Inquest, Marriage, Death, Citizenship, Declarations of Intention, etc., Certificates, Records, ca. 1870-1900
- San Benito County Naturalization Records, 1874-1929; Index, 1874-1939
- San Diego County Naturalization Records 1883-1958; Index to Naturalized Citizens 1868-1958
- San Diego Naturalization Index, 1868-1958
- San Francisco County Records, 1824-1997
- San Francisco County Restoration of Naturalization Record, Judgment Book: Aliens, ca.1870-1942; and Index
- San Francisco County, Index of Naturalized Voters, 1850-1898
- San Francisco, Registration Affidavits of Enemy Alien, 1918
- San Francisco, World War I Enemy Alien Registration Affidavits, 1918
- San Francisco, Chinese Immigration Certificate of Identity, 1908-1943
- San Joaquin County Great Registers, 1900-1910
- San Luis Obispo County Naturalization Records Index
- San Luis Obispo County 1890 Great Register with Index
- San Mateo County Naturalization Index, 1906-1945
- San Mateo County Naturalization Record Indexes pre-1906-1946+
- San Mateo County Records, 1851-1991
- San Mateo County Camp Fremont Naturalization Index, 1918-1919
- San Mateo County Camp Fremont Naturalization Index, 1918-1919
- San Mateo County Index to The Great Register 1890
- San Mateo County, Naturalization Records, 1856-1947
- Santa Barbara County Naturalization Index 1854-1920
- Santa Barbara County Declarations and Naturalizations, 1904-1906; Index 1850-1939
- Santa Barbara County Minutes of Superior Court, 1883-1924 and Register of Actions and Proceedings, 1880-1919, Index, 1880-1922
- Santa Barbara County, Repatriation Applications Index of Women
- Santa Clara County Naturalization Index 1850-1934
- Santa Clara County Great Register
- Santa Clara County Naturalization Records, 1831-1933
- Shasta County Great Register 1890
- Shasta County, Naturalization Records, 1850-1971
- Solano County Naturalization Card Index, ca. 1850-1950s
- Solano County Naturalization Records, 1868-1963
- Sonoma County Naturalization Records Index 1841-1906
- Sonoma County Naturalization Records, 1850-1935
- Sonoma County Index to Naturalizations, 1850-1985
- Stanislaus County Naturalization Records, 1869-1906; Indexes, 1854-1978
- Sutter County Naturalizations, 1854-1962
- Tulare County Naturalization Record Index
- United States, District Court, California Northern District City and County of San Francisco, Naturalization Records, 1860-1923
- United States, District Court, California Northern District Index to Naturalizations 1860-1989
- United States, District Court, California Southern District Declarations of Intention, 1927-1948
- United States, District Court, California Southern District General Card Index to Naturalized Citizens, 1915-1978
- United States, District Court, California Southern District Index Cards to Overseas Military Petitions 1943-45, 1954, 1955-56
- United States, District Court, California Southern District Naturalization Records 1887-1940; Index to Naturalization Records 1887-1937
- United States, District Court, California, San Francisco Military Petition Record of Naturalizations 1918
- United States, District Court, California, San Francisco Monthly Reports of Naturalization Papers 1939-1990
- United States, District Court, California, San Francisco Naturalization Records, 1903-1991
- Ventura County Naturalization Record Indexes
- Yuba County Naturalization Records, 1851-1941
- Yuba County Naturalizations, 1869-1903
Good Luck and Happy Hunting!