New York, Southern District Naturalization Index, 1917-1950
Card index to approximately 560,232 naturalizations. Originally three separate alphabetical card indexes to declarations of intention filed in the U.S. District Court for the Southern District of New York, located in New York City. Each original card file covered a separate time period: 1917-1927, 1928-1940, 1941-1950. NARA title: Alphabetical Index to Declarations of Intention of the U.S. District Court for the Southern District of New York, 1917-1950 (NARA M1675). Index courtesy of Fold3.
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New York, Naturalization Indexes
What is in This Collection?
This collection includes records from 1865 to 1957.
These collections are card indexes to naturalization records in the United States Circuit and District Courts of New York. The cards are arranged alphabetically by surname.
The actual naturalization volumes vary in size and format. Prior to the late 1800s each document was usually handwritten on one page. From the late 1800s and on, printed forms were used. After 1906 many entries were typewritten.
While there were various types of naturalization records, the Declaration of Intent and Naturalization Petition usually had the most complete genealogical information.
The first naturalization act was passed in 1802. Immigrants to the United States were not required to apply for citizenship. Of those who did apply, many did not complete the requirements for citizenship.
Naturalization to become a U.S. citizen was a two-part process: the Declaration of Intent to Naturalize, or First Papers, and the Naturalization Record (including the Naturalization Petition), or Final Papers. The First Papers were normally filed five years before the Final Papers because of the five-year residency requirement to become a citizen.
No centralized files existed before 1906. In 1906 federal forms replaced the various formats that had been used by the various courts. Copies were sent to the Immigration and Naturalization Service (INS), creating a central file for naturalization papers. The INS is now known as the U.S. Citizenship and Immigration Services (USCIS).
Naturalization records are generally well preserved, but some records may have been lost to fire or other disasters.
Naturalization is the process of granting citizenship privileges and responsibilities to foreign-born residents. New York’s counties recorded naturalization procedures in the court records as legal proof of citizenship. The courts handling naturalizations changed several times so the card index was created as a way to quickly access specific records.
The index is very accurate and the information that was current at the time of naturalization was usually reliable. However, there was always a chance for misinformation. Errors may have occurred because of the informant’s lack of knowledge or because of transcription errors or other circumstances.
Additional records and/or images may be added to this collection in the future.
What Can These Records Tell Me?
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The index cards include the following:
Some of the index cards also show:
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Declaration of Intent and Naturalization Petitions usually included the following:
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In post-1906 records, you may also find:
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Collection Content
Inventory
For a list of all the titles included in this Historical Records publication see New York, Eastern District Naturalization Petitions, Index - Inventory
Jurisdictions
The Eastern District had jurisdiction over the following counties:
The Southern District had jurisdiction over the following counties:
The Western District had jurisdiction over the following counties
Collection Details
Location of Original Records
National Archives and Records Administration
"New York, Southern District Naturalization Index, 1917-1950." Database. FamilySearch. http://FamilySearch.org : 12 February 2025. From "Alphabetical Index to Declarations of Intention of the U.S. District Court for the Southern District of New York, 1917-1950." Database. Fold3.com. http://www.fold3.com : n.d. Citing NARA microfilm publication M1675. Washington, D.C.: National Archives and Records Administration, n.d.