Free parcel data in Delaware

Yes. Delaware publishes a free statewide parcel layer: Delaware State Parcels 2.0, from Delaware FirstMap (Delaware Department of Technology and Information). Coverage: All 3 counties (New Castle, Kent, Sussex). It's a public ArcGIS REST service with no API key or login.

The layer

Layer	Delaware State Parcels 2.0
Publisher	Delaware FirstMap (Delaware Department of Technology and Information)
Coverage	All 3 counties (New Castle, Kent, Sussex)
Data vintage	Updated 2026-10-01 (UPDATED field)
Terms	Public; attribution: Delaware FirstMap and county governments
Fields	parcel number (PIN)
Not published	owner names, deed references, plat references
REST endpoint	`https://enterprise.firstmap.delaware.gov/arcgis/rest/services/PlanningCadastre/DE_StateParcels/FeatureServer/0`
Last verified	2026-10-19 with a live point and parcel-number query

Notes for GIS users

Geometry, PIN, acres and county only. PIN format differs by county: New Castle 10 digits (2603520039), Kent dashed (2-05-07709-04-3400-00001), Sussex its own format. Layer 1 of the service is parcel centroids. Owner/situs live in the county services.

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

Build a base plan