Connecticut Naturalization records online and Connecticut 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 Connecticut Census Records online for census record links and other helpful sources. Also see Connecticut Emigration and Immigration Records online.
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Connecticut Naturalization Records online at the federal level
US – Naturalization and Citizenship – United States Border Crossings from Canada to United States, 1895-1956, at FS
US – Naturalization and Citizenship – United States Border Crossings from Mexico to United States, 1903-1957, at FS
US – Naturalization and Citizenship – United States Index to Alien Case Files, 1940-2003, at FS
US – Naturalization and Citizenship – United States New England naturalization index, 1791-1906, at FS
US – Naturalization and Citizenship – United States, New England Petitions for Naturalization Index, 1791-1906, index
US – Naturalization and Citizenship – United States, New England, Petitions for Naturalization, 1787-1906, at FS
Connecticut Naturalization Records online at the state level
Connecticut – Naturalization and Citizenship – Connecticut, District Court Naturalization Indexes, 1851-1992, index & images, at FS
Connecticut – Naturalization and Citizenship – Connecticut, District Court naturalization indexes, 1851-1992, at FS
Connecticut – Naturalization and Citizenship – Naturalization record books, 1842-1903, at FS
Connecticut Naturalization Records online at the county level
Fairfield County – Naturalization and Citizenship – Connecticut, Fairfield County, Naturalization Records, 1850-1877, at FS
Fairfield County – Naturalization and Citizenship – Naturalization Records (Fairfield County, Connecticut) : [National Archives and Records Administration Record Group (RG) 200, RG 21], 1839-1955, at FS
Fairfield County – Naturalization and Citizenship – Naturalization record books, (Fairfield County, Connecticut) 1893-1906, at FS
Hartford County – Naturalization and Citizenship – Connecticut, Hartford County, Court of Common Pleas Naturalization Records, at FS
Hartford County – Naturalization and Citizenship – Connecticut, Hartford County, Naturalization Records, at FS
Hartford County – Naturalization and Citizenship – Connecticut, Hartford County, New Britain, Naturalization Records, at FS
Hartford County – Naturalization and Citizenship – Connecticut, Hartford County, Superior Court Naturalization Records, at FS
Hartford County – Naturalization and Citizenship – Declarations of Intention, Petitions, and Naturalization Testimony, (Hartford County, Connecticut), 1793-1898, at FS
Hartford County – Naturalization and Citizenship – Declarations of Intention, V. 1-3, 1876-1906; Index to Declarations, 1876-1904, at FS
Hartford County – Naturalization and Citizenship – Index to Naturalization Petitions 1876-1906 (Hartford County, Connecticut – Court of Common Pleas), at FS
Hartford County – Naturalization and Citizenship – Indexes to Naturalization Petitions for United States District Courts, Connecticut, 1926-1992, [Hartford] : NARA RG21 Publication M2081, at FS
Hartford County – Naturalization and Citizenship – Naturalization Record Book, 1876-1876, at FS
Hartford County – Naturalization and Citizenship – Naturalization Records (Hartford County, Connecticut) : NARA, RG21, 1906-1945, at FS
Hartford County – Naturalization and Citizenship – Naturalization Records (New Britain, Connecticut), 1874-1939 : NARA, RG21, at FS
Hartford County – Naturalization and Citizenship – Naturalization Records, 1834-1906 (Hartford County, Connecticut), at FS
Hartford County – Naturalization and Citizenship – Naturalization Records, 1876-1906; Index to Naturalization, 1876-1903 (Hartford County, Connecticut), at FS
Hartford County – Naturalization and Citizenship – Naturalization Testimonies and Records (Hartford County, Connecticut), 1876-1906, at FS
Litchfield County – Naturalization and Citizenship – Connecticut, Litchfield County, Naturalization Records, 1803-1906, at FS
Litchfield County – Naturalization and Citizenship – Index to Naturalization Petitions 1790-1906, 1906-1973 (Litchfield County, Connecticut – Court of Common Pleas, and Superior Court), at FS
Litchfield County – Naturalization and Citizenship – Naturalization Records (Litchfield County, Connecticut), 1906-1945 : NARA, RG21, at FS
Middlesex County – Naturalization and Citizenship – Connecticut, Middlesex County, Naturalization Records, 1790-1907, at FS
Middlesex County – Naturalization and Citizenship – Naturalization Records (Middlesex County, Connecticut), 1841-1945, at FS
Middlesex County – Naturalization and Citizenship – Naturalization Records, 1844-1871, at FS
Middlesex County – Naturalization and Citizenship – Naturalization Records, 1844-1909, at FS
New Haven County – Naturalization and Citizenship – Connecticut, New Haven County, City Court Naturalization Records, at FS
New Haven County – Naturalization and Citizenship – Connecticut, New Haven County, Court of Common Pleas Naturalization Records, 1874-1906, at FS
New Haven County – Naturalization and Citizenship – Connecticut, New Haven County, Naturalization Records, at FS
New Haven County – Naturalization and Citizenship – Connecticut, New Haven County, Superior Court Naturalization Records, 1803-1903, at FS
New Haven County – Naturalization and Citizenship – Connecticut, New Haven, Waterbury Superior Court Naturalization Records, 1907-1926, at FS
New Haven County – Naturalization and Citizenship – Connecticut, Waterbury Naturalization Records, 1885-1906, at FS
New Haven County – Naturalization and Citizenship – Indexes to Naturalization Petitions for United States District Courts, Connecticut, 1851-1926 [New Haven] : NARA RG21 Publication M2081, at FS
New Haven County – Naturalization and Citizenship – Indexes to Naturalization Petitons for United States District Courts, Connecticut (Waterbury, Connecticut) 1972-1988 : NARA RG21 Publication M2081, at FS
New Haven County – Naturalization and Citizenship – Name Index to Declarations Filed, 1844-1923, at FS
New Haven County – Naturalization and Citizenship – Name Index to Petitions Filed, 1843-1923, at FS
New Haven County – Naturalization and Citizenship – Naturalization Records (New Haven County, Connecticut), 1906-1945, at FS
New Haven County – Naturalization and Citizenship – Naturalization Records (New Haven, New Haven, Connecticut), 1874-1877, 1906-1923, at FS
New Haven County – Naturalization and Citizenship – Petitions and Records of Naturalization (Meriden, New Haven, Connecticut), 1903-1939, at FS
New London County – Native Races – A Man Called Sampson : the Ancestry and Progeny of Sampson, a Mashantucket Pequot Indian, Born in What is Now New London County, Connecticut – Including Brief Descriptions of Family Connections to Other Historic Native American Family Groups, the Ancient Pequot Tribe, the Pequot War, at FS
New London County – Naturalization and Citizenship – Connecticut, New London County, Court of Common Pleas Naturalization Records, at FS
New London County – Naturalization and Citizenship – Connecticut, New London County, Naturalization Records, at FS
New London County – Naturalization and Citizenship – Connecticut, New London County, Superior Court Naturalization Records, at FS
New London County – Naturalization and Citizenship – Declarations of Intentions, 1875-1906, at FS
New London County – Naturalization and Citizenship – Naturalization Books, 1854-1975, at FS
New London County – Naturalization and Citizenship – Naturalization Books, 1874-1906, at FS
New London County – Naturalization and Citizenship – Naturalization Papers, 1875-1902, at FS
New London County – Naturalization and Citizenship – Naturalization Records (New London County, Connecticut), 1872-1906, 1909-1945, 1856-1945, at FS
Tolland County – Naturalization and Citizenship – Connecticut, Tolland County, Naturalization Records, at FS
Tolland County – Naturalization and Citizenship – Declarations of Intention, 1853-1927, at FS
Tolland County – Naturalization and Citizenship – Naturalization Record Book, 1876-1876, at FS
Tolland County – Naturalization and Citizenship – Naturalization Records (Tolland County, Connecticut), 1853-1945; Naturalization Index, 1853-1955, at FS
Windham County – Naturalization and Citizenship – Connecticut, Windham County, Naturalization Records, at FS
Windham County – Naturalization and Citizenship – Declarations of Intentions, 1855-1906, at FS
Windham County – Naturalization and Citizenship – Index to Naturalization Records 1927-1974 (Windham County, Connecticut – Superior Court), at FS
Windham County – Naturalization and Citizenship – Naturalization Records (Windham County, Connecticut), 1808-1945, at FS
Windham County – Naturalization and Citizenship – Naturalizations, 1855, at FS
Windham County – Naturalization and Citizenship – Naturalizations, 1855-1906, at FS
Connecticut Naturalization Records online at the city level
Ansonia – Naturalization and Citizenship – Naturalization Records, 1893-1906, at FS
Ansonia – Naturalization and Citizenship – Naturalization Records, 1904-1906, at FS
Ansonia – Naturalization and Citizenship – Register of Declarations and Naturalizations Filed, 1900-1906, at FS
Bridgeport – Naturalization and Citizenship – Indexes to Naturalization Petitions for United States District Courts, Connecticut, 1963-1992 [Bridgeport] : NARA RG21 Publication M2081, at FS
Hartford – Naturalization and Citizenship – Index to Naturalization Petitions 1834-1898 (Hartford, Connecticut – Superior Court), at FS
Hartford – Naturalization and Citizenship – Indexes to Naturalization Petitions for United States District Courts, Connecticut, 1926-1992, [Hartford] : NARA RG21 Publication M2081, at FS
Hartford – Naturalization and Citizenship – Naturalization Record Book, 1876-1876, at FS
Meriden – Naturalization and Citizenship – Indexes to Naturalization Petitions 1939-1955 and Declarations of Intention 1939-1954(Meriden, Connecticut – Superior Court), at FS
Meriden – Naturalization and Citizenship – Judges’ Memorandums on Naturalization Petitions, 1903-1906, at FS
Meriden – Naturalization and Citizenship – Naturalization Papers, 1867-1878, at FS
Meriden – Naturalization and Citizenship – Petitions and Records of Naturalization (Meriden, New Haven, Connecticut), 1903-1939, at FS
New Britain – Naturalization and Citizenship – Connecticut, Hartford County, New Britain, Naturalization Records, at FS
New Britain – Naturalization and Citizenship – Index to Naturalization Petitions 1917-1939, 1875-1906 (New Britain, Connecticut – City Court), at FS
New Britain – Naturalization and Citizenship – Index to Naturalization Petitions 1939-1973 (New Britain, Connecticut – Superior Court), at FS
New Britain – Naturalization and Citizenship – Naturalization Records (New Britain, Connecticut), 1874-1939 : NARA, RG21, at FS
New Britain – Naturalization and Citizenship – Naturalization Records (New Britain, Connecticut), 1939-1945, at FS
New Haven – Naturalization and Citizenship – Connecticut, New Haven County, City Court Naturalization Records, at FS
New Haven – Naturalization and Citizenship – Indexes to Naturalization Petitions for United States District Courts, Connecticut, 1851-1926 [New Haven] : NARA RG21 Publication M2081, at FS
New Haven – Naturalization and Citizenship – Name Index to Declarations Filed, 1844-1923, at FS
New Haven – Naturalization and Citizenship – Name Index to Petitions Filed, 1843-1923, at FS
New Haven – Naturalization and Citizenship – Naturalization Records (New Haven, New Haven, Connecticut), 1874-1877, 1906-1923, at FS
New London – Naturalization and Citizenship – Connecticut, New London County, New London City, Petitions for Naturalization, 1793-1855, at FS
Waterbury – Naturalization and Citizenship – Connecticut, New Haven Waterbury, Naturalization Records, 1854-1906, at FS
Waterbury – Naturalization and Citizenship – Connecticut, New Haven, Waterbury Superior Court Naturalization Records, 1907-1926, at FS
Waterbury – Naturalization and Citizenship – Connecticut, Waterbury Naturalization Records, 1885-1906, at FS
Waterbury – Naturalization and Citizenship – Indexes to Naturalization Petitons for United States District Courts, Connecticut (Waterbury, Connecticut) 1972-1988 : NARA RG21 Publication M2081, at FS
Waterbury – Naturalization and Citizenship – Naturalization Records (Waterbury, Connecticut), 1906-1945, at FS
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