Free parcel data in Connecticut

Yes. Connecticut publishes a free statewide parcel layer: Connecticut CAMA and Parcel Layer, from Connecticut Office of Policy and Management, CT GIS Office. Coverage: All 169 towns. It's a public ArcGIS REST service with no API key or login.

The layer

Layer	Connecticut CAMA and Parcel Layer
Publisher	Connecticut Office of Policy and Management, CT GIS Office
Coverage	All 169 towns
Data vintage	2026 parcel + CAMA collection (Parcel_Collection_Year 2026)
Terms	Public; attribution: CT GIS Office / OPM and contributing municipalities
Fields	parcel number (Parcel_ID, CAMA_Link, Link); site address (Location); owner (Owner); deed reference
Not published	plat references
REST endpoint	`https://services3.arcgis.com/3FL1kr7L4LvwA2Kb/arcgis/rest/services/Connecticut_CAMA_and_Parcel_Layer/FeatureServer/0`
Last verified	2026-10-19 with a live point and parcel-number query

Notes for GIS users

Parcel_ID is only unique within a town; pair with Town_Name. CAMA_Link = '<town code>-<Parcel_ID>'. Location_1 is the CAMA situs string if Location is blank. CT has no county government; FIPS field is a 11-digit county-subdivision code and COG holds the planning region. Unversioned layer is the current year; prior years exist as *_2023/_2024/_2025 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 Connecticut address, with LiDAR contours, soils, flood zones and wetlands.

Build a base plan