Nassau County property records are public files kept by county and state offices. They show who owns a property, how much it is worth, what taxes are owed, and every deed or mortgage tied to the parcel.
Anyone can look at these records for free using the official websites run by the Nassau County Clerk and the Nassau County Department of Assessment.
What Are Nassau County Property Records?
Nassau County property records are written files about every land parcel in the county. The county sits on Long Island in New York State. It covers cities like Hempstead, Long Beach, Glen Cove, and more than 60 unincorporated villages. Each piece of land has its own file. The file holds the owner’s name, the address, the size of the lot, the building details, the tax value, and the history of who bought and sold it.
These records are public because New York State law says government files must be open. You do not need to give a reason to look at them. You do not need to live in Nassau County. You only need to know how to use the right websites.
Who Keeps the Records in Nassau County?
Three main offices hold Nassau County property records. Each one handles a different part of the file.
The Nassau County Clerk records every deed, mortgage, lien, and satisfaction of mortgage. When someone buys or borrows against a home, the paper is filed with the Clerk. The Clerk keeps the original and lets the public see copies online.
The Nassau County Department of Assessment places a value on every parcel each year. It writes the tax roll. It also stores property cards, which show the lot size, building size, year built, and any changes to the structure.
The Nassau County Treasurer collects the taxes. The Treasurer’s office keeps a list of who paid, who owes money, and which properties face tax liens.
Main Ways to Search Nassau County Property Records
You can look up property records in Nassau County by address, owner name, or Section-Block-Lot number. The SBL number is the most accurate way to search. It is a 16-digit code that acts like a fingerprint for each parcel.
Search by Section-Block-Lot (SBL)
The SBL system is how Nassau County tracks every piece of land. The first digits are the section. The next are the block. The last are the lot. You can find the SBL on an old tax bill or a deed. Once you have it, the search is fast and exact.
Search by Address
If you only know the street address, the official tools can still find the parcel. Type in the full address. The site will show the owner, the SBL number, the assessed value, and the last sale date.
Search by Owner Name
This works for people or companies. The system shows every parcel that person or company owns in the county. It is useful for title searches and skip tracing.
Official Websites for Nassau County Property Records
20/20 Perfect Vision Land Records (Nassau County Clerk)
This is the Clerk’s online system for deeds and mortgages. The full name is the 20/20 Perfect Vision Land Records I2 system. It shows records from the County Clerk’s office going back many decades. The site is free to use. You can look up records by name, document type, or recording date. You can also see scanned images of the original documents.
The Clerk’s office adds new records to the site every day. The system covers warranty deeds, quitclaim deeds, mortgages, satisfactions of mortgage, liens, and many other land-related papers.
Nassau County Department of Assessment
The Assessment Department runs a public search tool on the county website. It shows the current owner, the property address, the SBL number, the tax class, the assessed value, and the property card. The site is free to view. Printed copies of property cards cost a small fee.
NYS Office of Real Property Tax Services (ORPTS)
ORPTS is a state office under the New York State Department of Taxation and Finance. It does not keep Nassau County records, but it does run the Municipal Data Portal. The portal has sales data and tax rate tables for every town and city in the state. It is helpful for checking the median sale price in Nassau County or the equalization rate.
NYS Tax Parcels Public Viewer (ArcGIS)
This is a map-based tool. It shows parcel lines for almost every county in New York State, including Nassau. You can zoom in to see one lot or zoom out to see the whole county. The map links to basic property facts like the SBL number and the owner name.
What Information You Can See in the Records
Owner Information
Every parcel record shows the current owner’s name. It also shows the mailing address. The mailing address is often the same as the property, but sometimes it is a bank, a lawyer, or a holding company. The record also shows how much of the property the person owns. One parcel can be owned by more than one person or company.
Property Description
The record tells you the lot size, the building size, and the year built. It shows the number of bedrooms and bathrooms. It lists any extras like a garage, a pool, or a finished basement. For commercial property, it shows the building type, the lot frontage, and the zoning class.
Valuation Data
The Department of Assessment sets a value on every property each year. The record shows the assessed value, the land value, and the full market value. It also shows the tax class. Nassau County uses four tax classes: Class 1 for one- and two-family homes, Class 2 for apartments, Class 3 for utility property, and Class 4 for commercial and industrial property.
Tax Bill and Payment History
You can see if the taxes are paid or unpaid. The Treasurer’s office keeps this data. It shows the general tax amount, the school tax amount, and any special district charges. If the taxes are unpaid, the record will show the amount owed and the year of the debt.
Sales History
Every time a property is sold, a new deed is recorded. The record shows the sale date, the sale price, and the document type. You can trace the chain of ownership back many years using the Clerk’s records.
Deeds, Mortgages, and Liens
The Clerk’s office holds the legal documents. You can see the deed that transferred the property. You can see the mortgage paper if there is a loan on the home. You can see the satisfaction of mortgage when the loan is paid off. You can also see any liens for unpaid taxes, contractors, or court judgments.
How to Look Up a Nassau County Property by Address
- Go to the Nassau County Department of Assessment property search page on the county website.
- Type in the full street address, including the city or hamlet name.
- Pick the right result from the list if more than one comes up.
- Read the property record. It shows owner, SBL, assessed value, and tax class.
- Click on the property card link to see the building details and sketch.
- Use the SBL number to look up the deed and mortgage on the County Clerk’s 20/20 Perfect Vision site.
How to Look Up Nassau County Property by Owner Name
- Go to the County Clerk’s 20/20 Perfect Vision Land Records site.
- Choose “Search by Name” from the menu.
- Type in the last name first, then the first name. For businesses, type the full company name.
- Pick a date range or leave it open for all years.
- Look through the list of matching names. Each result shows the document type, the date recorded, and the book or page number.
- Click on the document to see a scanned image of the original paper.
How to Find the SBL Number
The SBL number is on the tax bill, the deed, and the mortgage. If you do not have any of these, you can still find the SBL. Go to the NYS Tax Parcels Public Viewer map. Search by address. The map will show the parcel outline and the SBL number next to the lot.
Nassau County Property Taxes and the Assessment Roll
The Nassau County Department of Assessment places a new value on every property each year. The tentative assessment roll is set on January 2 each year. The roll is open to public review. If you think the value is too high, you can file an appeal with the Assessment Review Commission.
Property taxes in Nassau County include a general tax, a school tax, and sometimes a special district tax. The general tax is set by the county legislature. The school tax is set by each school district. Special districts cover things like fire protection, garbage pickup, and water service. The total bill is sent out once a year and is due in two payments.
Appealing a Nassau County Property Assessment
If you think your property is worth less than the assessed value, you can file a complaint. The Assessment Review Commission handles the first level of review. The commission meets to hear cases and decide if the assessment should be lowered.
To file an appeal, you fill out a form from the ARC. You can get the form from the county website or by calling the ARC office. You need to support your claim with evidence. This can include recent sale prices of similar homes, photos of problems with the property, or a private appraisal.
There is a deadline to file. The deadline is set each year based on when the new tentative roll is published. The county posts the deadline on the ARC page. If you miss the deadline, you must wait until the next year’s roll is published.
Nassau County Housing Market Data
Nassau County is one of the most expensive housing markets in the United States. The average home value in the county was $859,544 as of early 2026. This was up 4.8 percent from one year earlier. The high prices reflect the strong demand for homes on Long Island close to New York City.
Sales activity is tracked by the NYS Department of Taxation and Finance. The state publishes the residential median sale price for each county. For Nassau County, the median sale price is well above the statewide average. The full data is on the ORPTS sales statistics page.
The Federal Reserve Bank of St. Louis also tracks Nassau County housing data. The FRED database has the All-Transactions House Price Index for Nassau County-Suffolk County, NY. It also has the active listing count, which shows how many homes are for sale at any given time.
What Records Are Not Public in Nassau County
Most Nassau County property records are public. A few items are not open to the public. Social Security numbers on old documents are redacted. Bank account numbers on mortgage papers are also redacted. Some juvenile court records linked to property are sealed. If a record is sealed, you must go to court to ask for access.
Official Nassau County Property Records Contacts
Nassau County Department of Assessment
240 Old Country Road, Mineola, NY 11501
Phone: (516) 571-1500
Assessment Review Commission (ARC)
Phone: (516) 571-3214
Email: ARC@nassaucountyny.gov
Nassau County Clerk’s Office
240 Old Country Road, Mineola, NY 11501
Phone: (516) 571-3000
NYS Department of Taxation and Finance – ORPTS
W.A. Harriman Campus, Albany, NY 12227
Phone: (518) 591-5232
Office hours for Nassau County offices are typically Monday through Friday, 9:00 a.m. to 4:45 p.m. Phone lines are open during the same hours.
Frequently Asked Questions About Nassau County Property Records
How Do I Find Out Who Owns a Property in Nassau County?
You can look up the owner using the Nassau County Department of Assessment search tool. Type in the address. The record shows the current owner’s full name and mailing address. You can also use the County Clerk’s 20/20 Perfect Vision site. Search by name to see all parcels under that name, or search the deeds to see who signed the most recent transfer. Both sites are free to use. The data updates within days of any new deed or mortgage being recorded.
Are Nassau County Property Records Free to View?
Yes. Basic property records are free to view online. The Nassau County Department of Assessment search tool is free. The County Clerk’s 20/20 Perfect Vision Land Records site is also free for viewing. You can search and look at scanned document images at no cost. Some printed copies of property cards or certified copies of deeds cost a small fee. The fee is set by the county and is posted on the office’s website.
What Is an SBL Number in Nassau County?
SBL stands for Section, Block, and Lot. It is a 16-digit code that Nassau County uses to track every parcel. No two parcels in the county share the same SBL. The number is on every tax bill and deed. It is the most accurate way to search county records. The state GIS map also shows the SBL next to each parcel outline.
How Often Is the Nassau County Assessment Updated?
The Nassau County Department of Assessment sets a new tentative assessment roll each year on January 2. The roll is then open for review. Property owners have a set window to file an appeal. After the appeal period ends, the roll becomes final. The final roll is used to compute the next tax bill. The cycle repeats every year.
Can I See Old Deeds for Nassau County Property?
Yes. The County Clerk’s 20/20 Perfect Vision site has scanned images of deeds going back many decades. The exact start date depends on what has been digitized. Some very old records may still be on microfilm at the Clerk’s office. You can call the Clerk to ask about older records. There may be a small copy fee for paper records.
How Do I File a Property Tax Appeal in Nassau County?
You file an appeal with the Assessment Review Commission. The ARC phone number is (516) 571-3214. The email is ARC@nassaucountyny.gov. You can also get the form on the county website at nassaucountyny.gov. The form asks for the SBL, the address, your contact info, and the reason for the appeal. You must file before the deadline, which is posted each year on the ARC page.
What Is the Difference Between the County Clerk and the Department of Assessment?
The County Clerk records the legal documents. This includes deeds, mortgages, liens, and satisfactions. The Department of Assessment sets the value of the property and writes the tax roll. The Treasurer collects the tax money. For ownership questions, start with the Department of Assessment. For deed and mortgage questions, start with the County Clerk.