Download Nassau County, New York GIS parcel data - 410,534 parcels with owner names, site & mailing addresses, acreage, land use, and sale values. Instant delivery in Shapefile, FileGDB, GeoPackage, GeoJSON & CSV. $100 per county.
Data freshness: NYS ITS/ORPTS 2025 assessment roll attributes; NYS parcel centroid service publication date: May 2026; last loaded into LandAI on 2026-05-13.
Every purchase includes all five export formats (Shapefile, FileGDB, GeoPackage, GeoJSON & CSV), standardized to the LandAI parcel schema with WGS84 (EPSG:4326) geometry. After checkout you choose which formats to generate and download them for 45 days.
Field completeness measured across 410,534 active parcels (NYS ITS/ORPTS 2025 assessment roll attributes; NYS parcel centroid service publication date: May 2026; last loaded into LandAI on 2026-05-13):
| Field | Coverage |
|---|---|
| Owner names | 99.7% |
| Site addresses | 100% |
| Owner mailing addresses | 99.7% |
| Deeded acres | 99.7% |
| Calculated (GIS) acres | 100% |
| Assessed total value | 99.7% |
| Market total value | 99.7% |
These are 7 of the 48 standardized fields in the LandAI parcel schema. Live per-field completeness for every field is shown on this page's interactive view.
Nassau County, New York has 410,534 active parcels in the LandAI dataset (source data as of 2025).
Every parcel includes the standardized LandAI schema: parcel ID and geometry plus owner names (99.7%), site addresses (100%), owner mailing addresses (99.7%), deeded acres (99.7%), calculated (GIS) acres (100%), assessed total value (99.7%), market total value (99.7%), and more.
Shapefile, FileGDB, GeoPackage, GeoJSON & CSV. Every $100 county purchase includes all five formats; you choose which to generate after checkout and can re-download for 45 days.
NYS ITS/ORPTS 2025 assessment roll attributes; NYS parcel centroid service publication date: May 2026; last loaded into LandAI on 2026-05-13.
Yes - 99.7% of Nassau County parcels include a normalized owner name, along with owner mailing addresses where the county provides them.
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