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County Department of Assessment

Nassau County Property Assessment and Land Records Search

Use Nassau County’s Land Records Viewer to search by address or section-block-lot (SBL) and review assessment, tax-map, exemption, prior-tax and comparable-sale information. The Department of Assessment sets values; the independent Assessment Review Commission reviews annual grievances through AROW, and local town or city receivers generally issue the tax bills.

Visit Official Office Website ↗Open Official Property Search ↗Open Official Parcel Map ↗View Official Exemption Resources ↗Open Official Appeal Information ↗Open Official Recorded Documents ↗
Independent-site notice: County Property Lookup does not maintain the official record or accept property-tax payments. Use the listed office and official portals for filings, searches and payments.
Parcel identifierSection, block and lot (SBL)
AssessmentDepartment of Assessment
Annual grievanceAssessment Review Commission / AROW
Tax billTown or city receiver

Search Nassau County assessment and land records

The Land Records Viewer is the starting point for a Nassau property. It can be searched by address or SBL and may show assessment-roll information, tax maps, property photographs, prior taxes, tax rates, exemptions and comparable sales.

  1. Search by house number, street name, town and ZIP when you do not know the SBL.
  2. Omit directional prefixes and street-type suffixes if the address search fails.
  3. Use the SBL when available and make sure its section, block and lot format matches the assessment database.
  4. Open the parcel and compare the location, tax class, assessment, exemptions and photograph.
  5. Use the County Clerk database separately for recorded deeds because Clerk and Assessor identifiers can be formatted differently.
Address-search tip: The official viewer advises entering the street name without directionals or suffixes. A parcel can be easier to find by SBL than by a mailing-style address.

Assessment is separate from the tax bill

The Department of Assessment develops the annual value and maintains property records and tax maps. The Assessment Review Commission is an independent agency that decides applications for correction of assessment. School and general property-tax bills are normally issued by the responsible town or city receiver, not by the Department of Assessment.

Use AROW for an annual assessment grievance

AROW, Assessment Review on the Web, supports property lookup, comparable-sale research, electronic grievance filing and appeal-status tracking. Nassau creates a new assessment each year, so an owner must challenge the applicable tentative roll even when an earlier appeal remains unresolved.

As of July 27, 2026, the regular ARC filing period for the 2027/28 assessment has closed. The official review calendar shows the next steps for that roll and will publish the dates for the next tentative assessment. Do not reuse an old date on a future filing.

What to prepare for an ARC filing

  • The correct SBL and property address.
  • The assessment and requested market value.
  • Comparable sales selected for similarity, location and relevant valuation date.
  • Photographs, repair estimates or documents supporting a physical-condition claim.
  • Authorization when a representative files for the owner.

Exemptions and record corrections

The Department of Assessment processes exemption applications and maintains property characteristics. If an exemption is missing, verify the applicable tax year and approval status. If a building characteristic, mailing address or owner entry is wrong, identify the exact field and provide the Department with the SBL and supporting document. A title dispute still belongs in the recorded-document and legal process.

Buyer due diligence in Nassau County

  • Review the current and tentative assessment rolls.
  • Identify exemptions that may belong only to the seller.
  • Check both school and general tax obligations with the correct local receiver.
  • Compare the assessor SBL with the County Clerk record.
  • Do not treat a tax-map line as a boundary survey.

Nassau County direct questions

What is an SBL in Nassau County?

SBL means section, block and lot. It is the parcel identifier used in Nassau assessment and tax-map records.

Can I appeal a Nassau assessment without a lawyer?

Yes. The Assessment Review Commission states that an owner may file through AROW without hiring a lawyer and there is no ARC filing fee.

Is the 2026 Nassau ARC filing period still open?

No. The regular 2027/28 assessment filing period ran from January 2 through March 2026 and is closed as of this page’s July 27, 2026 verification date. Check the official calendar for the next roll.

Does Nassau County send every property-tax bill?

No. School and general tax bills are generally issued by the responsible town or city receiver. Use the assessment record to identify the taxing location, then use that receiver’s official payment system.

Can the Land Records Viewer replace a deed search?

No. Its assessment data, tax maps and ownership display are useful for identification, but recorded deeds and legal instruments must be searched through the County Clerk’s real-estate records.

Official sources checked

Verification note: Office details, action links and current-cycle information were checked on 2026-07-27. Filing windows, tax portals and service hours can change. Reopen the official destination before submitting a form, relying on a deadline or entering payment information.

Source and data quality

Official Verified Last verified: 2026-07-27 · Data quality: 100/100

Recently checked0 days since field review
FieldStatusChecked
Official officeOfficial Verified2026-07-27Office contactOfficial Verified2026-07-27Property searchOfficial Verified2026-07-27Parcel/GIS mapOfficial Verified2026-07-27Recorded documentsOfficial Verified2026-07-27Assessment appealOfficial Verified2026-07-27Exemptions or reliefOfficial Verified2026-07-27