LandBrief

Suffolk County

Parcel & Property Data

584,583Total Parcels
—Avg. Market Value
1,440,510Total Acres (measured from parcel boundaries)

About This Data

LandBrief holds 584,583 parcel records for Suffolk 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 Suffolk County assessor roll dated August 2023, loaded August 2026. See data sources for every county’s vintage.

Explore Suffolk County

Suffolk County by the Numbers

Median parcel size
0.29 acres
measured from mapped boundaries
90th-percentile parcel
1.1 acres
County land area
582,997 acres
U.S. Census measurement
Communities
354
0.1% of parcels outside any incorporated place

Who Owns Suffolk County?

Share of the county’s 584,583 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 typeShare of parcels
Individuals80.8%
Companies & organizations10.0%
Trusts & estates5.7%
Government3.1%
Other / unclassified0.4%

The largest owner on record is COUNTY OF SUFFOLK with 9,041 parcels — see the full landowner leaderboard.

Parcel Records (~584,583 total)

per page
Parcel IDOwnerAddressCityAcreage
1000130000100001004STATE OF NEW YORK—Unincorporated197872.60 †
0300205000100001000STATE OF NEW YORK—Unincorporated149832.71 †
0600001000100001001RIVERHEAD TOWN OF—Unincorporated90768.95 †
0200001000100001002BROOKHAVEN TOWN OF—Unincorporated67329.03 †
0900395000200001000STATE OF NEW YORK—Unincorporated45585.20 †
0200985500200001000STATE OF NEW YORK—Unincorporated44073.62 †
0800190000100001004SMITHTOWN TOWN OF—Unincorporated36050.37 †
0400286000100001001HUNTINGTON TOWN OF—Unincorporated20786.18 †
0500485000100001000TOWN OF ISLIP—Unincorporated16281.61 †
0100247000100001000STATE OF NEW YORK—Unincorporated15396.69 †
Page 1 of 58459

Download Suffolk County parcel data

All 584,583 parcels in Suffolk County as a single file — free, no account needed. Shapefile, GeoJSON, GeoPackage, CSV and Parquet.

Get Suffolk County on FreeParcelData →

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Frequently Asked Questions

How many parcels are in Suffolk County?

The Suffolk County assessor roll on file records 584,583 parcels across 354 communities, with 0.1% lying outside any incorporated place.

Who owns the most land in Suffolk County?

COUNTY OF SUFFOLK holds 9,041 parcels, the most of any owner on record — the largest-landowners leaderboard ranks the top 25.

What is the typical parcel size in Suffolk County?

Measured from mapped boundaries, the median parcel is 0.29 acres, and nine parcels in ten are under 1.1 acres. Boundary-measured area closely tracks deeded acreage but is not the deed.

How much of Suffolk County is government-owned?

Government entities — federal, state, and local — hold 3.1% of the county’s parcels, classified from owner names on the roll.

How current is this data?

It comes from the Suffolk County assessor roll dated August 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 (354)

584,583 parcels across 354 communities in Suffolk County.