Nassau County, New York Property Owner Lookup
Who owns property in Nassau County? Enter the street address below to see the owner of record and the tax-roll mailing address as the public roll lists it.
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AssessorBrief is a private company, not affiliated with any county or government office.
Researching a parcel in Nassau County? Type the address and AssessorBrief returns the owner of record, tax-roll mailing address, site address, and assessed or market value (with Pro) from the New York tax parcel centroids (2025), with the file date.
Nassau County covers western Long Island, from Hempstead and Garden City to Oyster Bay. Mineola is the county seat. Nassau keeps a single countywide assessment roll covering the Town of Hempstead, North Hempstead, Oyster Bay and two cities, Glen Cove and Long Beach.
What's in a Nassau County brief
Every field named above, plus the parcel ID, a map, the file date, and brief and exhibit PDFs. See a sample brief
Source and citation
Every Nassau County brief cites the New York tax parcel centroids (2025). New York assessment is done town by town and city by city.
Nassau County at a glance
Nassau County is home to about 1,392,438 people, the 5th most populous of New York's 62 counties, with 7.0% of the state's residents. Its 285 square miles of land work out to roughly 4,894 residents per square mile, 11.6 times the New York average. Another 169 square miles are water.
Sources: Census Bureau population estimates (July 2024) and the Census 2024 Gazetteer.
Nassau County questions
Who owns property in Nassau County?
Enter the property's address above. You get the owner of record exactly as the New York tax parcel centroids (2025) lists it.
Who keeps property records in Nassau County?
In Nassau County, town and city assessors, county by county, keeps the roll. AssessorBrief cites it through the New York tax parcel centroids (2025).
What counties are near Nassau County?
The closest New York counties to Nassau County are Queens County, Bronx County, Kings County, New York County, and Westchester County. Each lookup works the same way across the state line, too: Pro covers all states.
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Data comes from the public assessor roll as published. Verify against the official record before relying on it. Not a title search or legal opinion. Use subject to our Terms.