Nassau County property owner lookup with mortgage and sale history

The short answer

In Nassau County, deeds and mortgages are recorded with the county clerk, assessments are set by the county, and taxes are collected by the county and towns, each on its own site. Hercules has a free public page for every Nassau parcel, and its full report puts the owner of record, mortgages, sale history, the county assessment and unpaid taxes in one place.

What to look up

You needWhere it is keptIn Hercules
Owner of recordThe latest recorded deedYes, with mailing address and how long they have owned it
MortgagesRecorded mortgages and satisfactionsYes, with lender, amount, dates, estimated balance and equity
Sale historyRecorded deedsYes, every sale with buyer, seller and price
AssessmentThe county assessment rollYes
Unpaid taxesThe county treasurerYes, in Nassau

Steps

  1. Search the address in Hercules to open the parcel's free page.
  2. Read the owner of record and whether the owner lives there.
  3. Open the full report for every mortgage, the sale history, the assessment and unpaid taxes.
  4. For the signed original of a document, request it from the county clerk.

Long Island: every parcel in Nassau and Suffolk counties has a free public page, and its full report carries the same detail as any US report below, plus the county assessment roll and unpaid taxes in Nassau. Permits, violations and zoning analysis are New York City only today.

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Questions

Does Hercules cover Suffolk County too?
Yes. Every parcel in Nassau and Suffolk has a free public page and a full report. Unpaid taxes are shown in Nassau only today.
Can I see who owns several properties in Nassau?
Yes. A full report lists the owner's other properties with their total value, equity and mortgage balance.
Is the Nassau parcel page free?
Yes. The public page for every parcel is free. A full report uses credits, and your first one is free.