Free parcel data in Colorado

Yes. Colorado publishes a free statewide parcel layer: Colorado Public Parcels, from Colorado Governor's Office of Information Technology (OIT) GIS. Coverage: 44 of 64 counties. It's a public ArcGIS REST service with no API key or login.

The layer

Layer	Colorado Public Parcels
Publisher	Colorado Governor's Office of Information Technology (OIT) GIS
Coverage	44 of 64 counties. Missing: Alamosa, Baca, Bent, Chaffee, Cheyenne, Conejos, Costilla, Crowley, Delta, Fremont, Jackson, Kiowa, Kit Carson, Las Animas, Lincoln, Mineral, Montrose, Otero, Phillips, Prowers
Data vintage	Collected annually; dateReceived April 2026 for sampled counties
Terms	Public; attribution: Colorado OIT GIS Team and contributing county/local governments
Fields	parcel number (parcel_id, account); site address (situsAdd); owner (owner); legal description; subdivision
Not published	deed references, plat references
REST endpoint	`https://gis.colorado.gov/public/rest/services/Address_and_Parcel/Colorado_Public_Parcels/FeatureServer/0`
Last verified	2026-10-19 with a live point and parcel-number query

Notes for GIS users

countyFips is the 3-digit county part as text ('031' Denver), countyName also available. account is the county assessor account number and is NOT unique statewide (R0008939 matched 3 parcels); filter by county when using it. A point that hits only a street returns 0 features.

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

Build a base plan