Nassau County

Parcel & Property Data

419,340Total Parcels

—Avg. Market Value

259,192Total Acres (measured from parcel boundaries)

About This Data

LandBrief holds 419,340 parcel records for Nassau County, sourced from county records. Each includes the parcel boundary, and — where the county publishes them — owner, situs address, acreage, assessed values and legal description.

Data from the Nassau County assessor roll dated May 2023, loaded August 2026. See data sources for every county’s vintage.

Explore Nassau County

Nassau County by the Numbers

Median parcel size: 0.15 acres
measured from mapped boundaries
90th-percentile parcel: 0.47 acres
County land area: 182,108 acres
U.S. Census measurement
Communities: 137
0.1% of parcels outside any incorporated place

Who Owns Nassau County?

Share of the county’s 419,340 parcels by the kind of owner on record. Classified from owner names, so the boundaries are approximate; an entity the rules cannot place counts as an individual.

Owner type	Share of parcels
Individuals	86.1%
Companies & organizations	6.7%
Trusts & estates	5.6%
Government	1.4%
Other / unclassified	0.3%

The largest owner on record is COUNTY OF NASSAU with 2,387 parcels — see the full landowner leaderboard.

Parcel Records (~419,340 total)

Showper page

Parcel ID	Owner	Address	City	Acreage
21.-88-303	CHOPIN NESTOR	10 HARBOR HILL RD	Glen Cove	0.18 †
21.-88-313.D	CARRERA MICHAEL J & E M	120 HARBOR HILL RD	Glen Cove	0.25 †
21.-38-213	GRAZIOSI ARMANDO & CONCETTA	25 LA MARCOS AVE	Glen Cove	0.46 †
21.-38-132	ABBONDANDOLO FRANK & RINE CAPR	11 LA MARCUS AVE	New Hyde Park	0.24 †
21.-38-135	ABBONDANDOLO FRANK & RINA CAPR	11 LA MARCUS AVE	New Hyde Park	0.33 †
21.-258-35	MELENDEZ JOHN P & RUTH	16 LA MARCUS AVNUE	Glen Cove	0.52 †
21.-258-59	YOUNG ADULT INSTITUTE INC	18 LA MARCUS AVE	Glen Cove	0.52 †
21.-38-209	CAVESE B & R	21 LA MARCUS AVE	Glen Cove	0.54 †
21.-258-58	STULIC MARIJAN & SLAVKA	22 LA MARCUS AVE	Glen Cove	0.56 †
21.-38-212	CHEN XUE	23 LA MARCUS AVE	Glen Cove	0.54 †

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All 419,340 parcels in Nassau County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.

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Frequently Asked Questions

How many parcels are in Nassau County?

The Nassau County assessor roll on file records 419,340 parcels across 137 communities, with 0.1% lying outside any incorporated place.

Who owns the most land in Nassau County?

COUNTY OF NASSAU holds 2,387 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in Nassau County?

Measured from mapped boundaries, the median parcel is 0.15 acres, and nine parcels in ten are under 0.47 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

How much of Nassau County is government-owned?

Government entities — federal, state, and local — hold 1.4% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the Nassau County assessor roll dated May 2023. Counties deliver on their own schedules; the methodology page explains how records are processed and the data sources page tracks every county’s vintage.

Browse by City (137)

419,340 parcels across 137 communities in Nassau County.