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Nassau County, New York
Genealogy, History & Facts

Nassau County, New York Facts

Nassau County

When was Nassau County, NY Created?
Nassau County was created on 1899 from Queens County. This particular county was named in honor of the Princes of Orange-Nassau ruled the Netherlands when Long Island was a Dutch colony .

What is the County Seat of Nassau County, NY?
The County Seat is located in Mineola and in addition the county government website is

What counties are adjacent to Nassau County, NY?
Bordering Counties are Suffolk County (east), Queens County (west).

What cities and towns are in Nassau County, NY?
Cities and towns located in the County include Mineola, Glen Cove, Long Beach, Hempstead, North Hempstead, Oyster Bay.

Nassau County, NY Vital Records

Where can find Nassau County Birth, marriage, Divorce and Death Records?
Nassau County vital records can be found at the New York Department of Health which has copies of birth records after 1881 and death records after 1880, copies of marriage since 1881 (A marriage license may also sometimes be found in the office of the town or city clerk who issued the license) and a Divorce records since 1847 (Is handled in the supreme court for the county in which the divorce was heard. Divorce files, however, are sealed for one hundred years). There is a fee for each copy requested. Please refer to the information to the Statewide Vital Records in New York for current fees and application process.

You can search online for Nassau County Birth, Marriage, Divorce or Death Records. You can also Order Electronically Online or can download an application for New York Birth and Death Certificate, Marriage and Divorce Certificate Application to mail.

Nassau County, NY Census Records

What Nassau County, NY census records are available?
There are many types of census records for Nassau County guide you in researching your family tree. Federal Population Schedules are available for 1900, 1910, 1920, 1930, 1940. You can get free downloadable and also printable census forms to help you with your research. See Also New York Census Records Research Guide

Nassau County, NY Courthouse and Government Records

Nassau County Courthouse

What genealogical records can I find in the Nassau County Courthouse?
The below facts shows exactly what death, marriage, birth, property, wills, and court records are typically in Nassau County. The years listed below are the first noted records with this county. See Also New York Corthouse Records Research Guide.

  • Nassau County Courthouse (all departments listed below are located here, unless otherwise noted)
    • Address: 240 Old County Road, Mineola, NY 11501
    • Also contact local Town Clerks. They are responsible for vast amounts of local information from deeds, property transfers, and genealogical materials. Research on place and road names, the history of property transfers and much more are available through your Town Clerk. They are a tremendous resources.
  • Nassau County Clerk  is the keeper of most civil and criminal trial court records for Supreme Court and County Court, naturalizations, marriages (1908–35), censuses (Some county clerks' offices hold duplicate copies of some of the State censuses taken periodically between 1825 and 1925 and copies of the federal census), as well as deeds and mortgages.
    • Phone: 516-571-2664
    • Land Records: 1899 (Land conveyances, deeds and mortgages are recorded in the county clerks' offices or in the New York City Register's Office. Recording of deeds became mandatory statewide in 1840. Before that many deeds were not recorded)
    • Court Records: 1899
    • Naturalization Records: State court naturalization records remain in custody of the county clerks. Older court naturalization records have been transferred to the National Archives--Northeast Region.
  • Nassau County Surrogate Court Clerk maintain records of wills, letters testamentary, letters of administration, orders and decrees, and appointments of guardians; and filed papers, including original wills, petitions for probate (gives date of death and lists next of kin), performance bonds, property inventories (seldom found after ca. 1900), administrator's or executor's accountings, etc. Surrogate's Courts create comprehensive indexes to records and files.
    • Address: 262 Old Country Road, Mineola, New York 11501
    • Phone: 516-571-2082 or 516-571-2847
    • Probate Records: 1899 (each county generally has records dating back to the establishment of the county or 1787, whichever was later. Record keeping was systematized by an 1830 statute)
  • Nassau County Treasurer is responsible for the collection of taxes.
  • Nassau County Historian maintains archival holdings for virtually every facet of the county’s history. In New York State, every municipality (town, city, village, county) must have an appointed historian. Most of the towns have their own historians as well and each can be contacted. 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.
    • Address: Nassau County Museum, 1864 Muttontown Road, Syosset, New York 11791
    • Phone: 516-571-7615
  • New York Wills, 1626-1836
  • BLM Land Records

Nassau County, NY Societies and Family History Resources

What genealogical and historical societies, archives, museums, associations and libraries are available for Nassau County, NY?
A list of Nassau County Historical  and Genealogical Societies, Libraries, Archives. See also list of Statewide New York Archives, Historical & Genealogical Societies.

  • Nassau County Historical Society, Box 207, Garden City, NY 11530 , Phone: 516-538-7679; The Nassau County Historical Society Journal is the offical publication and released annually.  The Society has no research staff
  • Long Island Studies Institute, Joan And Donald E. Axinn Library, Room 032, 123 Hofstra University, Hempstead, NY 11549-1230; Phone: 516-463-6411; Has Nassau County Historical Society collection of books and manuscripts
  • Baldwin Public Library , 2385 Grand Avenue, Baldwin, NY 11510-3289, Phone: 516-223-6228;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; 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.,
  • Hofstra University Library, Joan & Donald E. Axinn Library, Special Collections Department, Room 032, Hempstead, NY 11549-1000, Phone: 516-463-6158; 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; 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.,
  • Port Washington Public Library, One Library Drive, Port Washington, NY 11050, Phone: 516-883-440 x167; The library has a Local History Center containing digital collections and onsite marterial including newspapers, histories, maps, and manuscripts.
  • New York State Archives and Records Administration, 11th Floor, Empire State Plaza, Albany, NY 12230; (518) 474-8955
  • New York State Library, Cultural Education Center, 7th Floor, Empire State Plaza, Albany, NY 12230
  • The New York Genealogical and Biographical Society, 122 East 58th Street, New York, New York 10022-1939
  • New York State Historical Association, West Lake Road, P.O. Box 800, Cooperstown, New York, 13326-0800

Where can I connect with other Nassau County, NY Researchers through message boards and forums?

What other genealogical resources are available in Nassau County, NY?
The following are web links to Genealogy, Records and Resources pertaining to Nassau County. Most of these genealogy links fall into 3 categories: Business oriented Sites, Private Sites or Organization Sites. Some have free access some have to have a cost. This is simply a listing that has been compiled or submitted. I do not recommend or promote one genealogy site over another.

Nassau Co. NY Books, Newspapers & Publications

Nassau Co. NY Cemeteries & Church Records

Nassau Co. NY Family Websites, Pictures & Histories

Nassau Co. NY General and History Websites

Nassau Co. NY Immigration & Naturalization

Nassau Co. NY Maps, Atlases & Gazetteers

Nassau Co. NY Military Records

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