Nassau County Property Search: Records, Tax & Map 2026
Looking up a home or parcel in Nassau County, NY? The county’s official Land Records Viewer lets you search by street address or section, block and lot (SBL) to find assessment information, property characteristics, tax maps and available tax history.
For recorded deeds and mortgages, use the Nassau County Clerk. For a current property-tax bill or payment, go to the appropriate town or city tax office. These are different records maintained for different purposes.
Quick Answer: Where Do You Search?
Start with the Nassau County Land Records Viewer to locate a property by address or SBL and examine assessment, inventory and parcel-map information. The county’s assessment department maintains these records.
If you need ownership documents, mortgages or a recorded deed, use the County Clerk’s land-record search instead. To check your tax bill or payment status, use the Receiver of Taxes for the property’s town or the applicable city tax office.
Official Nassau County Property Search Tools
The correct website depends on the information you need. Nassau County separates valuation records, recorded real-estate documents and tax collection.
Assessment & Property Lookup
Look up parcel information, assessed values, property details, tax-map information, exemptions and other available assessment records.
County Clerk Land Records
Find recorded deeds, mortgages, mortgage satisfactions and other indexed real-estate documents.
Property Taxes
Find the correct municipal tax office for current school and general tax bills. Delinquent payments may be handled by the County Treasurer.
How to Search Nassau County Property Records by Address
You do not need to begin with a deed book or tax-roll document. For most residential searches, start with the property’s street address.
Open the official Land Records Viewer
Visit Nassau County’s assessment viewer. Follow the available property-search option. The site uses JavaScript and may require a CAPTCHA or account access for some functions.
Choose the address search
Enter the house number, street name and the appropriate town or ZIP code where requested. The viewer instructs users to leave directional and street-type suffixes out of its street-name field.
Match the correct parcel
Confirm the location, municipality, SBL identifier and property characteristics before relying on the result. Similar street names or multiple units can produce confusion.
Review the assessment record
Look for the applicable roll year, parcel characteristics, valuation fields, tax class, exemptions and available historical records. A displayed assessment is not automatically the property’s sale price.
Check the map and related records
Use the viewer’s tax-map or GIS connections to inspect the parcel’s mapped position. If you need title documents, move to the County Clerk’s separate records system.
Verify any official transaction
For taxes, certified deeds, an assessment correction or a property purchase, verify the information through the responsible government office. An online research result alone may not be suitable as legal proof.
Try a simpler street name without “Road,” “Street,” “Avenue” or compass directions, as instructed by the county’s viewer. If you already know the parcel identifier, search using section, block and lot instead.
What Information Can You Find in Nassau County Property Records?
The county’s assessment viewer contains multiple kinds of information, but the fields available for a particular parcel can vary. Some documents are maintained by a different office.
| Record | What It Tells You | Best Official Source |
|---|---|---|
| Property assessment | Assessed value, roll year and valuation information. | Department of Assessment |
| Section, block and lot | Parcel identification used in county records. | Land Records Viewer |
| Property characteristics | Available land, building and inventory information. | Assessment Viewer |
| Tax map | Mapped parcel location and nearby lot layout. | Assessment / GIS |
| Property tax bill | Taxes billed and payment information for a particular period. | Town or City Tax Office |
| Recorded deed | Recorded conveyance and named parties. | County Clerk |
| Mortgage records | Recorded mortgages and satisfactions. | County Clerk |
Do not treat tax assessments, recorded sales and market-value estimates as interchangeable figures. Each serves a different purpose.
Nassau County Property Tax Search and Payments
Nassau County property taxes are associated with the property’s tax districts, school district and municipality. The county assesses property, but current tax billing and collection commonly occur through the relevant town or city office.
Current School and General Taxes
Identify whether the parcel is in the Town of Hempstead, North Hempstead, Oyster Bay, Glen Cove or Long Beach. Use the appropriate tax office to check current bills, payment methods and due dates.
Delinquent Property Taxes
The Nassau County Treasurer handles specified delinquent general and school taxes. Collection responsibilities differ for certain cities. Check the Treasurer’s instructions before sending payment.
The Treasurer states that delinquent school-tax collection begins June 1 and delinquent general-tax collection begins September 1. Current taxes, delinquent taxes and tax liens have different payment procedures. Always verify the tax year and current status directly with the collecting office.
Why Your Assessment Does Not Equal Your Tax Bill
Assessment establishes a taxable value under the applicable rules. The actual tax bill also reflects tax rates, taxing jurisdictions, exemptions and other legally applicable adjustments. A reduction in assessed value does not necessarily produce an identical percentage reduction in taxes.
How to Check Whether Taxes Have Been Paid
Begin with the parcel’s municipality and tax identifier. Open the responsible tax collector’s official website, find its bill or payment service, and check the specific school or general tax period. If an online record is unclear, request confirmation from that office.
Nassau County Deed Search and Property Ownership Records
The Nassau County Clerk records documents relating to real property, including deeds, mortgages and mortgage satisfactions. The Clerk’s records are the correct starting place when you need to research a recorded transfer or obtain a copy of a deed.
How to Obtain a Certified Copy of a Deed
The Clerk provides certified deed copies by in-person or mail request. The published instructions ask for the property’s section, block and lot, which can generally be found on the tax bill.
The Clerk lists a $10 certified deed copy fee, including the $5 search fee, under its published instructions. Confirm the applicable fee, processing method and current office requirements before requesting a document.
See official deed-copy instructions ↗
A name appearing in assessment data or a deed search does not establish that a property is free of liens, competing interests or other title issues. For a purchase or legal dispute, obtain appropriate professional title review.
Nassau County GIS Maps, Tax Maps and Parcel Boundaries
Nassau County’s assessment Land Records Viewer provides parcel tax maps and links to geographic information. These tools can help locate the correct tax lot, understand nearby parcels and compare the mapped location with assessment information.
Find a Parcel
Search by street address or SBL. Confirm the parcel number and location before viewing the tax map.
Review the Tax Map
Inspect mapped lots and nearby properties. Maps are especially useful when several parcels share similar addresses.
Request an Official Map
The county provides tax-map copy services through its Tax Map Division. Contact the office for current copy requirements and costs.
County GIS and tax maps are useful research references. They are not substitutes for a boundary survey or a legal description when establishing property lines, easements or encroachments.
Nassau County, New York Location Map
This geographic map is for general orientation, not an official parcel-boundary or property-tax map.
Nassau County Property Assessments and Appeals in 2026
The Nassau County Department of Assessment values residential and commercial property annually. Its official website publishes tentative and final assessment information and explains assessment classes and exemptions.
For 2026 research, the county provides 2026/2027 final assessment rolls covering the towns of Hempstead, North Hempstead and Oyster Bay, plus Glen Cove and Long Beach.
Assessment Years Are Not the Same as Calendar Years
A roll labeled 2026/2027 refers to a defined assessment period. Do not automatically assume that a figure shown in a 2026 search is the current sale price or the amount payable on a 2026 bill. Verify the roll label, taxable status date and applicable billing cycle.
Can You Challenge Your Assessment?
Yes. The Nassau County Assessment Review Commission (ARC) reviews timely appeals of county property assessments. It is separate from the Department of Assessment, which prepares the valuations.
According to the county’s published schedule, the 2027/2028 assessment appeal period was extended through March 31, 2026. As of October 2026, that filing window has closed. The county currently lists January 4 through March 1, 2027 as the next filing period, covering the 2028/2029 assessment year.
ARC states that filing an assessment appeal is free and that a homeowner is not required to hire an attorney. Applicants should review the proper year’s instructions, supporting sales information and authorization requirements before filing.
Assessment appeals are time-sensitive. Verify the specific assessment year’s calendar and any subsequent extensions on ARC’s official website. Do not rely on the publication year of a general article as the filing deadline.
Property Search by Town and City
Nassau County covers several separate municipal jurisdictions. The countywide assessment system is the starting point for parcel valuation, but the right tax office depends on where the property is located.
| Municipality | Assessment Search | Tax Billing Direction |
|---|---|---|
| Town of Hempstead | Nassau County Assessment Viewer | Town Receiver of Taxes |
| Town of North Hempstead | Nassau County Assessment Viewer | Town Receiver of Taxes |
| Town of Oyster Bay | Nassau County Assessment Viewer | Town Receiver of Taxes |
| City of Glen Cove | Nassau County Assessment Viewer | City tax collection office |
| City of Long Beach | Nassau County Assessment Viewer | City tax collection office |
Village boundaries and special districts may affect individual taxes. Verify the actual municipal and taxing jurisdictions associated with the parcel rather than relying only on its postal address.
Nassau County Property Records Offices and Contact Information
Nassau County Department of Assessment
Address: 240 Old Country Road, 4th Floor, Mineola, NY 11501
Phone: 516-571-1500
Published hours: Monday–Friday, 8 a.m.–4:30 p.m.
Services: Assessment information, property valuation records, exemptions and tax maps.
Nassau County Clerk
Address: 240 Old Country Road, Mineola, NY 11501
Phone: 516-571-2664
Published hours: Monday–Friday, 9 a.m.–4:30 p.m., excluding holidays.
Services: Recorded deeds, mortgages, certified recorded documents and land-record indexes.
Assessment Review Commission
Address: 240 Old Country Road, 5th Floor, Mineola, NY 11501
Phone: 516-571-3214
Email: ARC@NassauCountyNY.gov
Services: Property assessment appeals, review status and grievance information.
Nassau County Treasurer
Phone: 516-571-2090
Office: 1 West Street, Mineola, NY.
Services: Delinquent property-tax collection and related tax payment information.
Confirm payment methods and office availability before visiting.
Office information is based on published county resources. Holiday schedules, services and transaction cutoff times can change.
Common Nassau County Property Search Problems
| Problem | Possible Explanation | What to Do |
|---|---|---|
| Address returns no result | Street-name formatting, town selection or address variation. | Remove suffixes and directions; retry using SBL. |
| Wrong parcel appears | Similar addresses or more than one associated lot. | Compare SBL, town, map and property details. |
| Assessment differs from sale price | Assessed value and transaction price measure different things. | Check the roll year and recorded sale documents separately. |
| Current tax bill is missing | The assessment viewer is not the current billing office. | Contact the correct town or city tax collector. |
| Deed not found | Searching the assessment system rather than recorded documents, or indexing differences. | Use the Clerk’s land-record search and verify search terms. |
| Map does not match a survey | Tax maps and legal surveys have different purposes. | Consult the recorded description and an appropriate survey professional. |
| Property details appear incorrect | Inventory information may require review or correction. | Contact the Department of Assessment and ask about its correction procedures. |
Verified Nassau County Property Record Resources
Use these government-published pages to continue your research. They are organized by the type of record rather than by a generic search-engine result.
Nassau County Property Search FAQs
Is Nassau County property search free?
The county makes public assessment and parcel information available through its official research tools. Searching public information is different from ordering certified document copies, which may carry fees. The viewer may also require CAPTCHA or registration for certain features.
Can I search Nassau County properties by address?
Yes. The official Land Records Viewer offers an address lookup. You can also search using the property’s section, block and lot number.
How do I find who owns a property in Nassau County?
Start with the assessment record for the parcel, then verify recorded ownership documents through the Nassau County Clerk. Deeds and assessment-owner fields serve different purposes and may not always reflect a recent transaction at the same time.
Where can I check Nassau County property taxes?
Use the appropriate town or city tax office for current bills. For delinquent tax information, consult the Nassau County Treasurer and confirm which office handles the particular tax and jurisdiction.
How can I obtain a copy of a Nassau County deed?
Use the Nassau County Clerk’s land-record service. The Clerk publishes in-person and mail procedures for certified deed copies, including the required SBL information and fees.
Does the Nassau County property viewer include maps?
Yes. The county’s assessment viewer includes tax maps and links to GIS-related information. These maps are intended for property research and do not replace legal surveys.
Can I appeal my property assessment?
Yes, during the applicable filing period. Nassau County’s Assessment Review Commission handles assessment appeals. The county lists January 4 through March 1, 2027, for the next assessment-year filing period. Check the official calendar for revisions.
Does this guide cover Nassau County, Florida?
No. This guide covers Nassau County, New York. Florida has separate property appraisal, tax collection and land-record authorities.
Start With the Correct Nassau County Office
For parcel information and valuation, use the Department of Assessment. For a recorded deed or mortgage, use the County Clerk. For current property-tax payments, use the correct town or city tax collector. For assessment appeals, contact the Assessment Review Commission.