California Naturalization records online and California Citizenship Records online may include declarations of intent, petitions for naturalization, oaths of allegiance, certificates of citizenship, passports, and more.

These records often provide names and aliases of a person, age, country of birth, ethnic background, date and port of arrival, the name of the ship, previous residences, or current address.

You can look at federal (1870-1920) and state census (1825-1925) records to see if your ancestor was naturalized. See California Census Records online for census record links and other helpful sources. Also visit California Emigration and Immigration Records online.

TIP – Login with your free FamilySearch account to unlock some collections — see other tips for opening FS resources.

KEY to collections

FS=FamilySearch FREE but login with your free account to access
Anc$=Ancestry – fee site
MH=MyHeritage – fee site
AG – AccessGenealogy
GGG – German Genealogy Group
GTHG – Genealogy Trails History Group
RW – RootsWeb

US level Naturalization Records

US – Naturalization Records – U.S. Naturalization Records, MH $

US – Naturalization Records – United States, New England Petitions for Naturalization Index, 1791-1906, index & images, at FS

California Naturalization Records online at the state level

California – Naturalization Records – California, Southern District Court (Central) Naturalization Index, 1915-1976, index & images, at FS

California – Naturalization Records – California County Naturalizations, 1831-1985, index & images, at FS

California – Naturalization Records – California, Northern U.S. District Court Naturalization Index, 1852-1989, index & images, at FS

California – Naturalization Records – California, northern U.S. District Court naturalization index, 1852-1989, at FS

California – Naturalization Records – General card index to naturalized citizens, 1915-1978, at FS

California – Naturalization Records – Index cards to overseas military petitions of the U.S. District Court for the Southern District of California, Central Division (Los Angeles), 1943-45, 1954, 1955-56 : NARA RG21 publication M1606, at FS

California – Naturalization Records – Index to naturalization in the U.S. District Court for the Northern District of California, ca. 1860-1989, at FS

California – Naturalization Records – Naturalization Records in the Superior Court of San Diego, California, 1883-1958 ; Index to Naturalized Citizens from the Superior Court of San Diego, California, 1868-1958 : NARA publications M1609, M1612, M1613, and M1526, at FS

California – Naturalization Records – Selected indexes to naturalization records of the U.S. Circuit and District Courts, Northern District of California, 1852-1928 : NARA RG21 publication T1220, at FS

California – Naturalization Records – California county naturalizations, 1831-1985, at FS

California – Naturalization Records – California court deposited declarations of intention from out-of-state, 1846-1903, at FS

California – Naturalization Records – Declarations of intention, 1927-1948, at FS

California – Naturalization Records – Military petition record of naturalizations (San Francisco, California), 1918 : NARA, RG, at FS

California – Naturalization Records – Monthly reports of naturalization papers (California), 1939-1990 : NARA, at FS

California – Naturalization Records – Naturalization records of the United States District Court for the Southern District of California, Central Division (Los Angeles), 1887-1940 ; index to naturalization records of the U.S. District Court for the Southern District of California, Central Division, Los Angeles, 1887-1937 : NARA publications M1524 and M1607, at FS

California – Naturalization Records – Naturalization records, 1903-1991 (San Francisco, California), at FS

California Naturalization Records online at the county level

Alameda County – Naturalization and Citizenship – California, Alameda County, Naturalization Records, 1853-1990, at FS

Alameda County – Naturalization and Citizenship – Naturalization Records, 1880-1931; and Index, 1853-1985, at FS

Alpine County – Naturalization and Citizenship – Naturalizations, 1867-1903, at FS

Alpine County – Naturalization and Citizenship – Naturalizations, 1904-1947; Indexes 1880-1916, at FS

Amador County – Naturalization and Citizenship – Naturalization Records, 1870-1943; Indexes 1864-1944, at FS

Butte County – Naturalization and Citizenship – Declaration of Intention to Become a Citizen, Index, 1849-1880, at FS

Butte County – Naturalization and Citizenship – Naturalizations, 1850-1930, at FS

Butte County – Voting Registers – Copy of the Uncanceled Entries Existing in the Great Register of Butte County, California on the Sixth Day of October, A.D. 1884 : a Correct Transcript Therefrom of the Name, Age, Country of Nativity, Occupation, Local Residence, Naturalization, and Date of Registration of the Persons Named in Said Uncanceled Entries, at FS

Calaveras County – Naturalization and Citizenship – Declarations of Intention, 1850-1929; Naturalization Records and Index, 1850-1950; Naturalization Petitions and Records, 1930-1959; Certificates of Naturalization, 1907-1916 : Calaveras, California, at FS

Colusa County – Naturalization and Citizenship – Naturalizations, 1851-1957, at FS

El Dorado County – Naturalization and Citizenship – Naturalization Records, 1883-1903; and Indexes, 1852-1938, 1850 to Date (1986), at FS

Fresno County – Naturalization and Citizenship – Naturalizations, 1875-1934, at FS

Glenn County – Naturalization and Citizenship – Naturalization Records, 1891-1929, at FS

Glenn County – Naturalization and Citizenship – Superior Court Minute Books, 1891-1923, at FS

Kings County – Naturalization and Citizenship – Kings County, California Immigration and Naturalization, 1893-1952, at FS

Lake County – Naturalization and Citizenship – Naturalizations, 1882-1929, at FS

Lassen County – Naturalization and Citizenship – Naturalizations, 1865-1935; Index 1865-1906, at FS

Los Angeles County – Naturalization and Citizenship – Declarations of Intention, 1927-1948, at FS

Los Angeles County – Naturalization and Citizenship – Index Cards to Overseas Military Petitions of the U.S. District Court for the Southern District of California, Central Division (Los Angeles), 1943-45, 1954, 1955-56 : NARA RG21 Publication M1606, at FS

Los Angeles County – Naturalization and Citizenship – Naturalization Records of the Superior Court of Los Angeles, California, 1876-1915 ; Naturalization Index of the Superior Court for Los Angeles County, California, 1852-1915 : NARA Publications M1614 and M1608, at FS

Mendocino County – Naturalization and Citizenship – Naturalization Records, 1848-1928; Indexes, 1858-ca. 1990, at FS

Napa County – Naturalization and Citizenship – Napa County, California, Naturalization Records, 1856-1936; Indexes to Declarations of Intention, and Naturalizations, 1856-1939, at FS

Nevada County – Naturalization and Citizenship – Nevada County Naturalization, Card Index, 1856-1950, at FS

Orange County – Naturalization and Citizenship – Naturalization Records, 1889-1944, at FS

Placer County – Naturalization and Citizenship – Naturalizations, 1852-1929, at FS

Placer County – Naturalization and Citizenship – Placer County, California, Naturalization Indexes, Ca. 1850-1980, at FS

Sacramento County – Naturalization and Citizenship – Naturalization Records, 1859-1906; Indexes, 1850-1955, at FS

Sacramento County – Naturalization and Citizenship – Sacramento County, California, Divorces and Naturalizations, 1879-1900, at FS

Sacramento County – Naturalization and Citizenship – Sacramento County Naturalization Index, 1860-1923, at FS

San Benito County – Naturalization and Citizenship – Decrees of the District and Superior Courts, 1874-1908, at FS

San Benito County – Naturalization and Citizenship – Miscellaneous Coroner’s Inquest, Marriage, Death, Citizenship, Declarations of Intention, Etc., Certificates, Records, Ca. 1870-1900, at FS

San Benito County – Naturalization and Citizenship – Naturalization Records, 1874-1929; Index, 1874-1939, at FS

San Diego County – Naturalization and Citizenship – California, San Diego Naturalization Index : COLLECTION RECORD, 1868-1958, at FS

San Diego County – Naturalization and Citizenship – Naturalization Records in the Superior Court of San Diego, California, 1883-1958 ; Index to Naturalized Citizens from the Superior Court of San Diego, California, 1868-1958 : NARA Publications M1609, M1612, M1613, and M1526, at FS

San Francisco County – Naturalization and Citizenship – California, San Francisco, Registration Affidavits of Enemy Alien, 1918, at FS

San Francisco County – Naturalization and Citizenship – California, San Francisco, World War I Enemy Alien Registration Affidavits : COLLECTION RECORD, 1918, at FS

San Francisco County – Naturalization and Citizenship – Restoration of Naturalization Record, Judgement Book : Aliens, Ca.1870-1942; and Index, at FS

San Francisco County – Naturalization and Citizenship – Selected Indexes to Naturalization Records of the U.S. Circuit and District Courts, Northern District of California, 1852-1928 : NARA RG21 Publication T1220, at FS

San Francisco County – Voting Registers – San Francisco County Index of Naturalized Voters, 1850-1898, at FS

San Mateo County – Naturalization and Citizenship – California, San Mateo County Records, 1851-1991, index & images (marriage, naturalization, land, military, patents)

San Mateo County – Naturalization and Citizenship – California, San Mateo County, Naturalization Records, 1856-1947, at FS

San Mateo County – Naturalization and Citizenship – California, San Mateo County Records : COLLECTION RECORD, 1851-1991, at FS

San Mateo County – Naturalization and Citizenship – California, San Mateo County, Naturalization Records, 1856-1947, at FS

San Mateo County – Naturalization and Citizenship – Camp Fremont Naturalization Index, 1918-1919, at FS

San Mateo County – Naturalization and Citizenship – San Mateo County Naturalization Index, 1906-1945, at FS

Santa Barbara County – Naturalization and Citizenship – Declarations and Naturalizations, 1904-1906 ; Index 1850-1939, at FS

Santa Barbara County – Naturalization and Citizenship – Minutes of Superior Court, 1883-1924 and Register of Actions and Proceedings, 1880-1919, Index, 1880-1922, at FS

Santa Clara County – Naturalization and Citizenship – Naturalization Records, 1831-1933, at FS

Shasta County – Naturalization and Citizenship – California, Shasta County, Naturalization Records, 1850-1971, at FS

Solano County – Naturalization and Citizenship – Naturalization Card Index, Solano County, Ca. 1850-1950’s, at FS

Solano County – Naturalization and Citizenship – Naturalization Records, Solano County, California, 1868-1963, at FS

Sonoma County – Naturalization and Citizenship – Index to Naturalizations, 1850-1985, at FS

Sonoma County – Naturalization and Citizenship – Sonoma County Naturalization Records, 1850-1935, at FS

Stanislaus County – Naturalization and Citizenship – Naturalization Records, 1869-1906; Indexes, 1854-1978, at FS

Sutter County – Naturalization and Citizenship – Naturalizations, 1854-1962, at FS

Yolo County – Naturalization and Citizenship – Naturalization Index Cards, 1867-1941, at FS

Yolo County – Naturalization and Citizenship – Naturalization Records, 1850-1957, at FS

Yuba County – Naturalization and Citizenship – Naturalization Records, 1851-1941, at FS

Yuba County – Naturalization and Citizenship – Naturalizations, 1869-1903, at FS

New York Naturalization Records online at the city level

Fresno – Naturalization and Citizenship – Petition for Naturalization and Delaration of Intention for Citizenship Papers : 1862-1927, at FS

Los Angeles – Naturalization and Citizenship – Index Cards to Overseas Military Petitions of the U.S. District Court for the Southern District of California, Central Division (Los Angeles), 1943-45, 1954, 1955-56 : NARA RG21 Publication M1606, at FS

Los Angeles – Naturalization and Citizenship – Naturalization Records of the Superior Court of Los Angeles, California, 1876-1915 ; Naturalization Index of the Superior Court for Los Angeles County, California, 1852-1915 : NARA Publications M1614 and M1608, at FS

San Diego – Naturalization and Citizenship – Naturalization Records in the Superior Court of San Diego, California, 1883-1958 ; Index to Naturalized Citizens from the Superior Court of San Diego, California, 1868-1958 : NARA Publications M1609, M1612, M1613, and M1526, at FS

San Francisco – Naturalization and Citizenship – California, City and County of San Francisco, Naturalization Records, 1860-1923, at FS

San Francisco – Naturalization and Citizenship – California, San Francisco County Records : COLLECTION RECORD, 1824-1997, at FS

San Francisco – Naturalization and Citizenship – Naturalization Records, 1903-1991 (San Francisco, California), at FS

San Francisco – Naturalization and Citizenship – Selected Indexes to Naturalization Records of the U.S. Circuit and District Courts, Northern District of California, 1852-1928 : NARA RG21 Publication T1220, at FS

California Naturalization records online