Nassau County property records lookup

There are three different things Nassau homeowners and buyers usually mean by “property records” — and they live in three different places:

• Tax & assessment records (assessed value, school district, exemptions, taxes paid). Maintained by the Nassau County Department of Assessment. This is what we show.
• Land records (deeds, mortgages, liens, easements, releases). Maintained by the Nassau County Clerk’s Land Records Viewer — the official LRV system, free to search.
• Building / permit records (CO, additions, violations). Held by each town or village building department (Hempstead, North Hempstead, Oyster Bay, Long Beach, Glen Cove, and each incorporated village).

If what you want is the assessed value, school district, exemption status, or estimated tax bill for a Nassau home, you can enter the address in our search at the top of this page. We pull from the current Nassau assessment roll and show:

• Section / Block / Lot (SBL) identifier
• 2025 assessor value and our estimated current market value (from recent comps)
• School district, town, and incorporated village (if any)
• STAR / Senior / Veteran / Disability exemptions currently on the roll
• Estimated annual tax bill, with the school/town/county breakdown
• What the bill becomes when current exemptions expire

The official version of this data lives at the My Nassau Property portal. It’s authoritative but harder to read; we mirror the same underlying numbers in plain English.

The Nassau County Clerk operates the Land Records Viewer (LRV), which is the official, free, public system for searching:

• Deeds (every transfer of ownership)
• Mortgages (and satisfactions/releases)
• Liens (tax liens, mechanics liens, federal liens)
• UCC filings (commercial security interests)
• Court judgments recorded against a property
• Easements and right-of-way agreements

You can search by name, address, document type, date range, or Section/Block/Lot. Document images are viewable free; certified copies require a small fee paid to the Nassau County Clerk.

If you pull up a Nassau parcel through our search, you’ll see these fields. They’re the same fields the assessor uses internally:

• SBL (Section / Block / Lot) — unique parcel identifier. Glossary entry.
• SWIS code — 6 digits identifying the town and village. Glossary entry.
• School district code — 6 digits identifying which of 55 Nassau districts the property is in.
• Property class — NY ORPS code. 210 = single family, 220 = two-family, 411 = apartment, 412 = condominium.
• Full market value — the assessor’s declared market value. Nassau’s ratio (RAR) is roughly 0.1%, so a $500k home shows assessment around $500.
• Assessed value — the number tax rate is applied to.
• Taxable assessed values — assessed minus exemptions, broken into county / town / school portions (a single parcel can have different exemption levels for each).
• Exemptions on file — Basic STAR, Enhanced STAR, Senior, Veteran (Alternative or Cold War), Disabled, Volunteer Firefighter, etc.

Nassau’s official portals are accurate but spread across half a dozen sites and require knowing the right system for each question. We pulled 424,058 Nassau parcels from the official state assessment roll and present them in one place, with the calculations done for you. Everything is sourced from public data; we link to the official sources in every section so you can verify any number.