Nassau County, New York Genealogy

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Guide to Long Island and Nassau County, New York ancestry, family history, and genealogy birth records, marriage records, death records, census records, and military records.

This page describes sources of genealogical data about Nassau County, New York Genealogy families, including links to smaller localities at the bottom of this page. New York, United States Genealogy-related pages show useful statewide sources. United States Genealogy pages explain the terminology and contents of genealogical records.

Nassau County, New York
Map of New York highlighting Nassau County
Location in the state of New York, United States Genealogy
Map of the U.S. highlighting New York
Location of New York in the U.S.
Founded 1899
County Seat Mineola
New York, Nassau County Courthouse.png
Address 240 Old County Road
Mineola, NY 11501
Nassau County Website

Nassau County New York Historical Facts[edit | edit source]

Description[edit | edit source]

The County was named for the old name for Long Island, which was at one time named Nassau, after the Dutch Prince William of Nassau, a member of the House of Nassau, itself named for the German town of Nassau. The County is located in the southeast area of the state. [1]

Nassau County, New York Record Dates[edit | edit source]

Known Beginning Dates for Major County Records[2]
Birth* Marriage Death* Court Land Probate Census
1880 1907 1880 1899 1899 1899 1663
*Statewide registration for births and deaths started in 1880. General compliance for births by 1915 and deaths by 1890.

Parent County[edit | edit source]

1899: Created from eastern 70 percent of Queens County.[3]

Boundary Changes[edit | edit source]

For animated maps illustrating New York County boundary changes, "Rotating Formation New York County Boundary Maps" (1683-1915) may be viewed for free at the website.

1664 Yorkshire became the first large government unit (not actually a county) organized by New York after the English took control from the Netherlands. It was divided into three ridings including North Riding (Westchester, Bronx, New York (Manhattan), Nassau and part of Queens counties).[4] [5]
1683 New York ended Yorkshire, creating Queens County (including later Nassau County) from part of Yorkshire.[4] [5]
1899 Nassau County was created from the eastern 70 percent of Queens County.[4]

Record Loss[edit | edit source]

There is no known history of courthouse disasters in this county.

Populated Places[edit | edit source]

For a complete list of populated places, including small neighborhoods and suburbs, visit HomeTown Locator. The following are the most historically and genealogically relevant populated places in this county:[6]


Nassau County New York Genealogy Resources[edit | edit source]

Bible Records[edit | edit source]

  • 1581–1917 New York, Family Bible Records at Ancestry($); Index. Database is a collection of genealogically important records taken from the Bibles of colony and state residents. Reveals the Bible's original owner, brief record of descendants,and a particular event such as birth or marriage as recorded in Bible.

Biography[edit | edit source]

Business Records and Commerce[edit | edit source]

Cemeteries[edit | edit source]

Cemetery records often reveal birth, death, relationship, military, and religious information.

Online Grave Transcripts Published Grave Transcripts County Cemetery Directories* Family History Library*** WorldCat* Tombstone Transcription Project*
Cemetery Site* Names in Stone* NYGenWeb Cemeteries*
New York Gravestones*   Names in Stone*
NYGenWeb Cemeteries*   Billion Graves*
Billion Graves*   FamilySearch Places
St. Paul's Presbyterian Church Cemetery    
St. Paul's Presbyterian Church Cemetery in Elmont    
*See the New York Cemeteries page for details about each site.

Census[edit | edit source]

Historical populations
Census Pop.
1900 55,448
1910 83,930 51.4%
1920 126,120 50.3%
1930 303,053 140.3%
1940 406,748 34.2%
1950 672,765 65.4%
1960 1,300,171 93.3%
1970 1,428,080 9.8%
1980 1,321,582 −7.5%
1990 1,287,348 −2.6%
2000 1,334,544 3.7%
2010 1,339,532 0.4%
Source: "".

For information and tips on using and accessing online census records, see New York Census.

Federal[edit | edit source]

U.S. Census Mortality Schedules for New York, 1850-1880:

  • Available online at Ancestry ($).
  • Deaths are included for the 12 months prior to the census, 1849-50, 1859-60, 1869-70, and 1879-80 beginning 1 June and ending 31 May of the census year.[7]
  • Basic contents of the records include: Name, sex, age, color, marital status, place of birth, month of death, occupation, and cause of death. 1870 also has parents' birthplace. 1880 lists how long a resident of the county.
  • Also on FHL Films 1415128–42.
State[edit | edit source]
Source 1825 1835 1845 1855 1865 1875 1892 1905 1915 1925 - - - - - - - - Yes Yes
Family History Library Films - - - - - - - - Yes Yes
FamilySearch Index and Images - - - - Yes Yes - Yes Yes Yes
New York State Library Films - - - - - - - - Yes Yes

Church Records[edit | edit source]

Church records are good substitutes for birth, marriage, and death information and are most often found on a local city/town or county level.  Published and manuscript church records can be found at public, university, and private libraries.

For a brief general history of denominations and a guide to finding various New York denomination's records, see New York Church Records Wiki page.
List of Churches and Church Parishes

Ann Mensch's Local Catholic Church and Family History & Genealogical Research Guide is a free online resource that identifies the parishes of Nassau County, years parishes were created, contact information, as well as links to online records and research tips. Nassau County parishes fall under the jurisdiction of the Diocese of Rockville Centre.

The following church records are available online:

  • 1660s-1770 - Hicks, Benjamin D. "Records of the Society of Friends of Westbury, L.I.," The New York Genealogical and Biographical Record, Births 1660s-1750s: Vol. 16, No. 4 (Oct. 1885):171-175; Births 1710s-1770: Vol. 17, No. 3 (Jul. 1886):218-222. Digital version at New York Family History ($); FHL Book 974.7 B2n v. 16-17. Internet Archive has digitized Vol. 17, but not Vol. 16.[8]
  • 1785-1878 - Frost, Josephine C. Marriages Recorded at Reformed Dutch Church, Manhasset, Long Island: 1785-1878, Also a Few Deaths 1841-1878. Brooklyn, N.Y., 1913. Digital version at Ancestry ($).
  • 1790-1900 - Quaker Marriages, Jericho Monthly Meeting, Long Island, New York. 1991. Digital version at Ancestry ($). Births 1812-1887, marriages 1790-1900, deaths 1813-1888.

Additional Church Records

Additional church records can sometimes be found using search phrases such as Nassau County, New York Genealogy Church Records  in online catalogs like:

Court Records[edit | edit source]

Ancestors may have also been involved in municipal, state, or federal court cases. See also New York Court Records and United States Court Records.

Crime and Criminals[edit | edit source]

Directories[edit | edit source]

Emigration and Immigration[edit | edit source]

Ethnic, Political, or Religious Groups[edit | edit source]

Maps and Gazetteers[edit | edit source]

Queens BoroughSuffolk CountyNY NASSAU.PNG
Click a neighboring county
for more resources

Genealogy[edit | edit source]

  • Rootsweb message board for Nassau County, New York Genealogy has many information threads about families that resided in that county. There is a search engine that allows you to search by surname and topic.

History[edit | edit source]

Wikipedia has more about this subject: Nassau County, New York

Land and Property[edit | edit source]

Land and property records can place an ancestor in a particular location, provide economic information, and reveal family relationships. Land records include: deeds, abstracts and indexes, mortgages, leases, grants and land patents.

See New York Land and Property for more details, especially about the papers generated in New York State by large speculative land companies.

Original land records in Nassau County, New York Genealogy began in [?dateyear?]. These records are housed at the [?repository?] in [?town?].




Additional land records can sometimes be found using these catalogs:

Maps[edit | edit source]


Migration[edit | edit source]

Military[edit | edit source]

Civil War[edit | edit source]

Service men in Nausau County served in various regiments. Men often joined a company (within a regiment) that originated in their county.[9]

- 14th Regiment, New York Cavalry, Companies A and B.
- 24th Regiment, New York Cavalry, Company D.
- 119th Regiment, New York Infantry, Company H.
- 139th Regiment, New York Infantry, Companies A and I.
- 142nd Regiment, New York Infantry, Company F.
- 145th Regiment, New York Infantry, Company K.
- 155th Regiment, New York Infantry, Companies D and E.
- 176th Regiment, New York Infantry, Companies C and D.
- 193rd Regiment, New York Infantry, Company G.
- 194th Regiment, New York Infantry, Companies A and C.

Naturalization and Citizenship[edit | edit source]

Indexes[edit | edit source]

The Family History Library has also acquired this comprehensive index for the years 1792 through 1906 on microfilm: FHL Film 1419807 (1st of 294 films). The courts this index covers are:

  • City Court of Brooklyn, 1836-1894
  • Kings County Court, 1806-1906
  • New York City Marine Court, 1806-1849
  • New York County Common Pleas Court, 1792-1895
  • New York County Superior Court, 1828-1895
  • New York City and County Supreme Court, 1868-1906
  • Queens County Court, 1799-1906
  • Queens County Surrogate Court, 1888-1898
  • Richmond County Court, 1869-1906
  • U.S. Circuit Court Southern District, 1846-1876
  • U.S. District Court Eastern District, (Kings, Queens, Nassau and Suffolk counties), 1865-1906
  • U.S. District Court Southern Court Southern District, (New York, Bronx and also Dutchess, Orange, Putnam, Richmond, Rockland, Sullivan and Westchester counties), 1824-1906[10]

Newspapers[edit | edit source]

Old Fulton NY Post Cards has the largest online collection of 400 New York 1795-2007 newspapers. The instructions for this quirky site are needed to get the most out of it.

Old Fulton NY Post Cards has the following Nassau County, New York Genealogy newspaper images:

  • Long Island NY Daily Star 1881-1889
  • Long Island NY Star Journal 1938-1967

Obituaries[edit | edit source]

Periodicals[edit | edit source]

Poorhouses, Poor Law, etc.[edit | edit source]

Probate Records[edit | edit source]

Probate records including original estates and wills for New York are held in the office of the county Surrogate Court beginning in 1787, or when the county was formed. Prior to 1787, most are housed at the New York State Archives. See New York Probate Records for more information about using probate records.
Content:  Probate Records may give the decedent's date of death, names of his or her spouse, children, parents, siblings, in-laws, neighbors, associates, relatives, and their place of residence.
Record types:  Wills, bonds, petitions, accounts, inventories, administrations, orders, decrees, and distribution.

Probate Petitions

In 1830, state law required the Surrogate Court clerk to issue a probate petition for a deceased individual with property. This petition, unique to New York, usually lists the deceased's death date. It also lists the heirs, their relationship to the deceased, and their residence. Alice Eichholz, Red Book: American State, County and Town Sources, 3rd ed. (Salt Lake City: Ancestry Pub., 2004), 479. At various libraries (WorldCat); FHL Book 973 D27rb 2004. Henry B. Hoff, "Navigating New York Probate," American Ancestors 12 (Fall 2011): 54.

These petitions are often found in the estate files and can be obtained from the county Surrogate Court.

Online Probate Indexes

Additional Probate Indexes and Abstracts

Additional probate indexes or abstracts can sometimes be found using search phrases such as Nassau County, New York Genealogy probate wills in online catalogs like:

Repositories[edit | edit source]

Archives, Libraries and Museums[edit | edit source]

The Nassau Library System consists of 54 public libraries in Nassau County. Each library has access to genealogical databases - especially newspaper sites. Many are accessible with your library card from home. A list of the libraries in this system and their website and contact information is found here.

Baldwin Public Library
2385 Grand Avenue
Baldwin, NY 11510-3289
Phone: 516-223-6228

Genealogical Resources: The library houses obituaries for local newspapers. The Baldwin History room houses history books on Nassau County and Baldwin as well as Suffolk, Queens, Kings, and New York Counties. Collections include journals, photographs, school records, directories, and yearbooks. Baldwin History room open by appointment only.

The Bryant Library
2 Paper Mill Road
Roslyn, NY 11576
Phone: 516-621-2240

Genealogical Resources: Bryant Room houses the local history collection that includes 19th and 20th century books, mapts, photographs,newspaper clippings, letters and documents.  They also have a special collection that includes materials on William Cullen Bryant, Clarence H. Mackay and Christopher Morley. List of collections.  Hours vary from the library. You can also make an appointment.

Hofstra University Library
Joan & Donald E. Axinn Library
Special Collections Department
Room 032
Hempstead, NY 11549-1000
Phone: 516-463-6158

Genealogical Resources: Has the historical and genealogical collections of the Nassau County Historical Society, Oceanside Historical Society Collection (now defunct), Nassau County Museum Reference Collection, family history collections, newspapers, and photographs.

Glen Cove Public Library
4 Glen Cove Avenue
Glen Cove, NY 11542-2885
Phone: 516-676-2130

Genealogical Resources: The Robert R. Coles Long Island History Room contains books; periodical series; artifacts; pamphlets; maps; microfilmed documents; records and manuscripts, and microfilm of local newspapers for the local area. The room has limited hours. Digital collection. Email for history room:

Port Washington Public Library
One Library Drive
Port Washington, NY 11050
Phone: 516-883-440 x167

Genealogical Resources: The library has a Local History Center containing digital collections and onsite marterial including newspapers, histories, maps, and manuscripts. The center has limited hours and can be contacted at:

County Historian's Office[edit | edit source]

Nassau County Historian[11]
Edward J. Smits, Director
Nassau County Museum
1864 Muttontown Road
Syosset, New York 11791
Phone: 516-571-7615
Fax: 516-571-7623

Genealogical Resources: The County Historian may provide access to obituaries, vital records, church records, maps, and family files or journals. Some historians provide search services for their office records and others may refer you to local genealogists who research in the area.

Courthouses[edit | edit source]

The Nassau County Clerk's office has marriage, land, court, military discharge and naturalization records as well as the state census. The Surrogate Court has probate records. For further information about where the records for Nassau County are held, see the Nassau County Courthouse page.

Family History Centers[edit | edit source]

Family History Center and Affiliate Library Locator map - search for local Family History Centers or Affiliate Libraries

  • Family History Centers provide one-on-one assistance, free access to center-only databases, and to premium genealogical websites.
  • FamilySearch Affiliate Libraries have access to most center-only databases, but may not always have full services normally provided by a family history center.

Local Centers and Affiliate Libraries

Societies[edit | edit source]

Nassau County Historical Society
Box 207
Garden City, NY 11530
Phone: 516-538-7679
Email: Natalie.A.Naylor"at"

The Nassau County Historical Society Journal is the offical publication and released annually.  The society has no research staff but their collection of books and manuscripts are located at:

Long Island Studies Institute
Joan And Donald E. Axinn Library, Room 032
123 Hofstra University
Hempstead, NY 11549-1230
Phone: 516-463-6411

Social Groups Online[edit | edit source]

Taxation[edit | edit source]

Town Records[edit source]

Town records in New York may include early births, marriages, deaths, divorces, local histories, selected military records, and town meeting minutes. Vital records from 1880/1882 are kept by town and village clerks, although some (Kent’s and Putnam Valley’s) are available in the County Historian’s Office. For further details, try the links to individual town Wiki pages found in Places. See also:

  • Gordon L. Remington, New York Towns, Villages, and Cities: A Guide to Genealogical Sources (Boston: New England Historic Genealogical Society, 2002). NEHGS online edition; At various libraries (WorldCat); FHL Book 974.7 D27r. Alphabetical list including date founded, if a town history exists, church and cemetery sources, and if a Civil War register (TCR) exists.

Vital Records[edit | edit source]

Vital records of birth, marriage or death were first recorded at the local level in the village clerk, town clerk, or city clerk’s ledger book. If you know where a birth, marriage or death took place, a copy of the certificate or record may be obtained by writing to the town, village or city clerk. See also How to order New York Vital Records or order electronically online.

See the heading Places on this wiki page for links to local community wiki pages and their available records. See New York Vital Records for a discussion about beginning dates and availability of vital records in New York.

Use substitute records for birth, marriage, and death information. These substitute records include Bible Records, Cemeteries, Church Records, Newspapers, and Probate Records.

Birth[edit | edit source]

Early births were recorded on the town level and the years vary by town. (List of towns) The New York State Department of Health (state level) began recording births in 1881. Births were not recorded on the county level.

Birth Substitutes

Marriage[edit | edit source]

Early marriages were sometimes recorded on the town level and the years vary by town. (List of towns) In 1880, town clerks were to record the marriage and a copy was sent to the New York State Department of Health (state level). Town clerks continue to record marriages. Marriages were recorded by the Nassau County clerk starting in 1907 and go until 1935.[12]

Marriage Substitutes

Divorce[edit | edit source]


All divorces were granted by the governor or legislature and were very rare.


All divorces were granted by the court of chancery. These records are found in the New York State Archives or for the New York City area at the New York County Clerk's office.These divorces were granted only on the grounds of adultery.


All divorces are handled by the county Supreme Court where the divorce was granted. Divorce files in New York are sealed for 100 years. Contact the County Clerk for information about divorce records.

Divorce judgment papers often include date and place of the marriage and the names and birthdates of any children. Local newspapers may publish notices of divorce actions.

Death[edit | edit source]

Early deaths were recorded on the town level and the years vary by town. (List of towns) The New York State Department of Health (state level) began recording deaths in 1881. Deaths were not recorded on the county level.

Death Indexes

Death Substitutes

Additional Resources

Additional resources for Nassau County births, marriages and deaths may be found in the New York, Nassau– Vital Records topic page of the FamilySearch Catalog . Copies of books found in the FamilySearch Catalog may be found in WorldCat catalog and ordered from your local library through interlibrary loan. Explore how to search the FamilySearch Catalog and the WorldCat Online Catalog.

Voting Registers[edit | edit source]

Nassau County New York Places[edit | edit source]

Nassau County New York Genealogy Websites[edit | edit source]

Nassau County New York Genealogy References[edit | edit source]

  1. Wikipedia contributors, "Nassau, New York" in,_New_York accessed 21 Nov 2018
  2. Handybook for Genealogists: United States of America, 10th ed. (Draper, Utah: Everton Pub., 2002), Nassau County, New York. Page 488-493 At various libraries (WorldCat); FHL Book 973 D27e 2002; Alice Eichholz, ed. Ancestry’s Red Book: American State, County, and Town Sources, Third ed. (Provo, Utah: Ancestry, 2004), 490-492.
  3. Handybook for Genealogists: United States of America, 10th ed. (Draper, Utah: Everton Pub., 2002), 490. At various libraries (WorldCat); FHL Book 973 D27e 2002.
  4. 4.0 4.1 4.2 Kathryn Ford Thorne, New York Atlas of Historical County Boundaries (New York: Simon and Schuster, 1993), 115, and 153-55. At various libraries (WorldCat); FHL Book 974.7 E7t.
  5. 5.0 5.1 Wikipedia contributors, "York Shire (Province of New York)" in Wikipedia: the Free Encyclopedia at (accessed 16 December 2011).
  6. Wikipedia contributors, "Nassau County, New York," in "Wikipedia: the Free Encyclopedia,,_New_York, accessed 25 January 2020.
  7. Arlene Eakle, and Johni Cerni, The Source: A Guidebook of American Genealogy (Salt Lake City: Ancestry, 1984), 103. At various libraries (WorldCat); FHL Book 973 D27ts.
  8. WeRelate contributors, "Source:New York Genealogical and Biographical Record (New York Genealogical and Biographical Society)," in WeRelate,, accessed 17 February 2012.
  9. Frederick Phisterer, New York in the War of the Rebellion, 3rd ed. (Albany, N.Y.: J. B. Lyon Company, 1912). Internet Archive digital copy; At various libraries (WorldCat); FHL Film 1486494-96; Fiche 6083559-64; Book 974.7 M2p.
  10. FamilySearch Catalog, FamilySearch, accessed 6 December 2011,
  11. Elizabeth Petty Bentley, Genealogist's Address Book: State and Local Resources, with Special Resources Including Ethnic and Religious Organizations, 6th ed. (Baltimore, Md.: Genealogical Pub., 2009), 432. At various libraries (WorldCat); FHL Book 973 D24ben 2009.
  12. Handybook for Genealogists: United States of America, 10th ed. (Draper, Utah: Everton Pub., 2002), 283. At various libraries (WorldCat); FHL Book 973 D27e 2002