Free parcel data in New York

Yes. New York publishes a free statewide parcel layer: NYS Tax Parcels Public, from NYS Office of Information Technology Services, Geospatial Services (NYS GIS Program Office). Coverage: 38 of 62 counties. It's a public ArcGIS REST service with no API key or login.

The layer

Layer	NYS Tax Parcels Public
Publisher	NYS Office of Information Technology Services, Geospatial Services (NYS GIS Program Office)
Coverage	38 of 62 counties. Missing: Allegany, Cattaraugus, Chemung, Chenango, Clinton, Columbia, Delaware, Dutchess, Essex, Franklin, Fulton, Herkimer, Jefferson, Madison, Monroe, Nassau, Niagara, Orleans, Saratoga, Schenectady, Schoharie, Seneca, Washington, Yates
Data vintage	2025 assessment roll, published May 2026 (updated annually)
Terms	Public; attribution: contributing counties, NYS ITS Geospatial Services, NYS DTF ORPTS
Fields	parcel number (PRINT_KEY, SBL, SWIS_PRINT_KEY_ID, SWIS_SBL_ID); site address (PARCEL_ADDR); deed reference
Not published	owner names, plat references
REST endpoint	`https://services6.arcgis.com/EbVsqZ18sv1kVJ3k/arcgis/rest/services/NYS_Tax_Parcels_Public/FeatureServer/1`
Last verified	2026-10-19 with a live point and parcel-number query

Notes for GIS users

Layer 0 of the same service is a coverage footprint, not parcels. PRINT_KEY is only unique within a SWIS (municipality); pair with SWIS or use SWIS_PRINT_KEY_ID. COUNTY_NAME values have no spaces (e.g. 'NewYork', 'StLawrence'). NYC boroughs come from MapPLUTO (SBL = BBL, no PRINT_KEY). Geometry not edge-matched between counties.

How to use it

QGIS: Layer > Data Source Manager > ArcGIS REST Server, add a connection with the service URL (the endpoint above without the final /0), then add the layer. Filter to your area before exporting.
ArcGIS Pro: Add Data > Data From Path, paste the endpoint.
Direct query: append /query?geometry=LON,LAT&geometryType=esriGeometryPoint&inSR=4326&spatialRel=esriSpatialRelIntersects&outFields=*&f=geojson to get the parcel at a point.
CAD: see getting a parcel into AutoCAD or Civil 3D.

Assessor parcel lines are for taxation and are often 5 to 50 ft off the legal boundary. Why.

Basesheet uses this to draw the parcel line on a base plan for any New York address, with LiDAR contours, soils, flood zones and wetlands.

Build a base plan