Free parcel data in Washington

Yes. Washington publishes a free statewide parcel layer: Current Parcels (Washington State Parcels Project), from WaTech Geospatial Program Office (WA Geospatial Portal). Coverage: All 39 counties. It's a public ArcGIS REST service with no API key or login.

The layer

Layer	Current Parcels (Washington State Parcels Project)
Publisher	WaTech Geospatial Program Office (WA Geospatial Portal)
Coverage	All 39 counties
Data vintage	Current annual compilation (WA Parcels Project)
Terms	Public; WaTech and contributing counties
Fields	parcel number (ORIG_PARCEL_ID, PARCEL_ID_NR); site address (SITUS_ADDRESS)
Not published	owner names, deed references, plat references
REST endpoint	`https://services.arcgis.com/jsIt88o09Q0r1j8h/arcgis/rest/services/Current_Parcels/FeatureServer/0`
Last verified	2026-10-16 with a live point and parcel-number query

Notes for GIS users

King County assessor GIS is used as a fallback when this layer misses.

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 Washington address, with LiDAR contours, soils, flood zones and wetlands.

Build a base plan