Naturalization records were filed in the city courts, superior courts, and the courts of common pleas. Many pre-1906 records are indexed and located at the Connecticut State Library. Some are in the county courts.

The National Archives—Northeast Region (Boston) has some local court records for New Haven County, and the cities of Ansonia, Hartford, and Meriden. It also has applications filed in U.S. circuit and district courts from about 1842 to 1955.

New England naturalization records for 1791 to 1906 were copied and indexed by the Works Progress Administration (WPA) in the late 1930s. Some of the records are more recent than 1906. The index gives the name and location of the court, the date of naturalization, and the volume and page number (or certificate number) of the naturalization record. The copies and index are at the National Archives— Northeast Region (Boston). The National Archives in Washington, D.C. and the Family History Library have microfilm copies of the index 1791-1906 (FHL films 1429671-787).

For records after 1906, contact the National Archives—Northeast Region (Boston) or the local office of the Immigration and Naturalization Service.

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