Free parcel data in Tennessee

Yes. Tennessee publishes a free statewide parcel layer: Tennessee Property Boundaries Public Use, from TN Comptroller of the Treasury, Division of Property Assessments (published on TNMap by STS/OIR). Coverage: 86 of 95 counties. It's a public ArcGIS REST service with no API key or login.

The layer

Layer	Tennessee Property Boundaries Public Use
Publisher	TN Comptroller of the Treasury, Division of Property Assessments (published on TNMap by STS/OIR)
Coverage	86 of 95 counties. Missing: Chester, Davidson, Hamilton, Hickman, Knox, Montgomery, Rutherford, Shelby, Williamson (Nashville, Memphis, Knoxville, Chattanooga, Clarksville, Murfreesboro, Franklin not covered)
Data vintage	Updated monthly from the state assessment system
Terms	Public; not intended for commercial use (Comptroller recommends the bulk download for commercial purposes). Graphical reference only, not legal boundaries.
Fields	parcel number (GISLINK, PARCELID, PARCEL); site address (ADDRESS); owner (OWNER); subdivision
Not published	deed references, plat references
REST endpoint	`https://services1.arcgis.com/YuVBSS7Y1of2Qud1/arcgis/rest/services/Tennessee_Property_Boundaries_Public_Use/FeatureServer/0`
Last verified	2026-10-19 with a live point and parcel-number query

Notes for GIS users

ADDRESS is street-name-first with the house number last (e.g. 'E MAIN ST 455'), so normalise before matching. GISLINK = 3-digit county id + control map + group + parcel (e.g. '057078P F 00400'); PARCELID adds special-interest and tax year ('057 078P F 00400 000 2026'). PARCEL alone (e.g. '004.00') is not unique; combine with CMAP/GP/COUNTY_NAME. COUNTY_ID is an alphabetical state index (57 = Madison), not FIPS.

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

Build a base plan