Nassau County property records
Where to look up owners, values, tax bills, parcel maps, deeds and value appeals in Nassau County, New York. Each link goes to the county or state office that keeps the record.
Where each record lives
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Owner, land, building and value
Look up an owner’s name and mailing address, land and building details and the assessed value in the Nassau County property search.
Contact details and how-tos are on the Nassau County property assessment office page.
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Tax bills and payments
Find the current bill, the balance due and past payments with the Nassau County property tax lookup.
Property taxes are billed and collected by the Nassau County Treasurer.
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Deeds, liens and recorded documents
Search deeds, mortgages, liens and other recorded documents in the Nassau County deed and lien search.
Contact details and how-tos are on the Nassau County land records office page.
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Value complaints and appeals
Deadlines, forms and how to file an appeal are on the Nassau County value appeals page.
Value appeals are heard by the Nassau County Assessment Review.
We haven’t found Nassau County’s parcel maps online. The county’s website, nassaucountyny.gov, lists its offices and how to reach them.
Links go to official county and state sites and were last checked in November 2026. Offices move their pages, so if one has changed, the county’s own website (nassaucountyny.gov) is the place to start.