Free parcel data in Maine

Yes. Maine publishes a free statewide parcel layer: Maine Parcels Organized Towns, from Maine GeoLibrary / Maine Office of GIS (MaineIT). Coverage: 325 organized towns that voluntarily submitted data; excludes the Unorganized Territory (separate Maine Revenue Services layer) and non-participating towns. It's a public ArcGIS REST service with no API key or login.

The layer

Layer	Maine Parcels Organized Towns
Publisher	Maine GeoLibrary / Maine Office of GIS (MaineIT)
Coverage	325 organized towns that voluntarily submitted data; excludes the Unorganized Territory (separate Maine Revenue Services layer) and non-participating towns
Data vintage	Town submissions of varying age (FMUPDAT, e.g. 2011 for Portland); layer republished 2026
Terms	Public; attribution: Maine GeoLibrary and contributing municipalities
Fields	parcel number (MAP_BK_LOT, STATE_ID); site address (PROP_LOC)
Not published	owner names, deed references, plat references
REST endpoint	`https://services1.arcgis.com/RbMX0mRVOFNTdLzd/arcgis/rest/services/Maine_Parcels_Organized_Towns/FeatureServer/10`
Last verified	2026-10-19 with a live point and parcel-number query

Notes for GIS users

Native SR is UTM 19N (26919); inSR=4326 queries work. PROP_LOC house numbers are zero-padded ('00423 CONGRESS ST'). MAP_BK_LOT is town-local and may contain double spaces ('027 B005'); STATE_ID = '<GEOCODE>_<MAP_BK_LOT>'. No owner/assessment attributes. Some COUNTY values are blank.

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

Build a base plan