Free parcel data in New Hampshire

Yes. New Hampshire publishes a free statewide parcel layer: New Hampshire Parcel Mosaic, from NH GRANIT (UNH Earth Systems Research Center, state GIS clearinghouse). Coverage: 236 town values incl. UNINCORPORATED (statewide mosaic); per-town completeness not independently checked. It's a public ArcGIS REST service with no API key or login.

The layer

Layer	New Hampshire Parcel Mosaic
Publisher	NH GRANIT (UNH Earth Systems Research Center, state GIS clearinghouse)
Coverage	236 town values incl. UNINCORPORATED (statewide mosaic); per-town completeness not independently checked
Data vintage	Mosaic of town submissions; dates not exposed in the layer
Terms	Public; attribution: NH GRANIT and contributing municipalities
Fields	parcel number (pid, displayid, nh_gis_id, u_id); site address (streetaddress)
Not published	owner names, deed references, plat references
REST endpoint	`https://nhgeodata.unh.edu/hosting/rest/services/Hosted/CAD_ParcelMosaic/FeatureServer/1`
Last verified	2026-10-19 with a live point and parcel-number query

Notes for GIS users

Field names are lowercase. pid/displayid are town-local; nh_gis_id ('<county 2><townid>-<pid>') and u_id ('<townid>-<pid>') are statewide. town values are mixed case (CONCORD vs Keene): compare case-insensitively. No owner/assessment attributes. Layer 0 = parcel points, layer 2 = additional lines.

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

Build a base plan