Online New York City Naturalization Records and Indexes

The Online New York Naturalization Records Guide has two pages:
New York City Naturalization Records (this page) and New York State Naturalization Records (next page)

Online New York City Naturalization Records and Indexes
There are a variety of courts in NYC where naturalizations took place. You may have to check more than one index. And some indexes may not yet be online. Some of these New York City listings may also include counties ouside of NYC.

New York City Naturalization Indexes and Records at Ancestry (these require payment):
- New York Naturalization Records and Indexes (State and Federal), 1794-1940 for courts in all 5 NYC boroughs plus nearby counties in Southern New York; includes digitized records from the NYC branch of the National Archives (has 2.9 million records)
- New York: Index to Petitions for Naturalization Filed in New York City, 1792-1989 includes digitized images of the index cards; has over 1.6 million entries from all 5 New York City boroughs
- New York County Supreme Court Naturalization Petition Index, 1907-1924 (Manhattan)
- Index to Declaration of Intent for Naturalization: New York County, 1907-1924 (Manhattan) has nearly 675,000 listings
- The above 4 databases (and Ancestry's Southern District database listed below) are included in a subscription to Ancestry's U.S. genealogy records collection
Southern District of New York - Manhattan and the Bronx; also: Columbia, Dutchess, Greene, Orange, Putnam, Rockland, Sullivan, Ulster and Westchester Counties
- Scanned Records - Southern District...
  - New York, Southern District, U.S District Court Naturalization Records, 1824-1946 (at FamilySearch/free) from National Archives Microfilm Publication M1972
  - Petitions for Naturalization From the U.S. District Court for the Southern District of New York, 1882-1944 (at Ancestry/requires payment) indexed; includes images from NARA Microfilm Publication M1972
- Scanned Indexes - Southern District...
  - Southern District Court of New York Naturalization Records Index, 1824-1959
  - Index to Declarations of Intention of the U.S. District Court, Southern District of New York, 1917-1950 (at Fold3) (searches are free - you can view scanned copies of the index cards for a fee) from National Archives Microfilm Publication M1675
  - Index to Petitions of Naturalization of the US District Court, Southern District of New York, 1824-1941 (at Fold3) (searches are free - you can view scanned copies of the index cards for a fee) from National Archives Microfilm Publication M1676
Eastern District of New York - Brooklyn, Queens and Staten Island; also: Nassau and Suffolk Counties
- Scanned Records - Eastern District...
  - Petitions for Naturalization of the U.S. District Court for the Eastern District of New York, 1865-1937 at Fold3 scanned documents from National Archives Microfilm M1879 - searchable by name (requires payment for full results) database is 96% complete
- Indexes - Eastern District...
  - Eastern District of New York Index to Naturalization Petitions, U.S. District Court, 1865-1957 at Fold3 for Kings (Brooklyn), Nassau, Queens, Richmond (Staten Island), and Suffolk Counties (scanned index cards from National Archives microfilm publication M1164; searchable by name; searches are free - requires payment for digitized copies of the index cards)
  - Eastern District Court of New York Naturalization Index Project 1865-1956 includes Kings (Brooklyn), Queens, Richmond (Staten Island), Nassau & Suffolk Counties
Bronx County Naturalization Index 1914-1952 and Queens County Naturalization Index mid 1800s-1957
Bronx County: also see the Southern District of New York section above
Kings County (Brooklyn) Naturalization Index 1907-1924
Kings County: also see the Eastern District of New York section above
Queens County: see the Eastern District of New York section above
Richmond County Naturalization Database 1883-1959 coverage varies by type of document
Richmond County (Staten Island): also see the Eastern District of New York section above

Other New York Genealogy Resources...

Online New York City Death Records and Obituaries

Online New York Birth and Marriage Records Indexes