Free parcel data in South Dakota

South Dakota has no single free statewide parcel layer we could verify, but many counties publish their own. Basesheet currently uses 2 South Dakota county services: Minnehaha, Pennington.

County layers

Minnehaha County

Layer	Minnehaha County Parcels (outside Sioux Falls)
Publisher	Minnehaha County GIS / Equalization (gis.minnehahacounty.gov)
Coverage	Minnehaha County outside the City of Sioux Falls only (about 23,000 parcels: small cities such as Brandon, Hartford, Dell Rapids, Garretson, and the townships). Sioux Falls city parcels are maintained by the City and are not in this layer.
Data vintage	County parcel layer with assessor attributes, edited continuously (edits through October 2026)
Terms	Public, no token; no license or use constraints stated on the service
Fields	parcel number (TAG, MAP_ID, MRRDID); site address (FULL_ADDRESS); owner (MRTNM1); legal description; subdivision
Not published	deed references, plat references
REST endpoint	`https://gis.minnehahacounty.gov/minnemap/rest/services/Parcels/MapServer/0`
Last verified	2026-10-20 with a live point and parcel-number query

MapServer layer 'County Parcels' (same data as MinnEmap/Cadastral/MapServer/0, which allows 2000 records). TAG is the 15-digit parcel tag with no separators, e.g. '012319426006000'; MAP_ID is the dashed form '01-23-19-426-006-000'; MRRDID is the assessor record id ('11142'). FULL_ADDRESS is the situs (blank on many rural parcels); NWLOCN/NWPRED/NWLOCS/NWSTYP are its space-padded parts. MRTNM1/MRTNM2 are owner names and MRTADR/MRTCTY/MRTSTATE/MRTZPC the owner mailing address. SUBDIVISION is a numeric code; ADDITION is the plat name. Assmnt_Year is the year the parcel record was created, not the roll year. The server returns 403 to requests with no User-Agent and occasionally drops a connection; retry. No deed or plat book fields.

Pennington County

Layer	Pennington County Tax Parcels (RCPC Open Data)
Publisher	Rapid City / Pennington County GIS (gis.rcgov.org), county Equalization parcel fabric
Coverage	All of Pennington County (about 54,800 parcels)
Data vintage	Parcel fabric with Equalization attributes, rebuilt 2026
Terms	Public open data, no token; no license or use constraints stated on the service or item
Fields	parcel number (PIN, TaxID); site address (PropAddress); owner (GranteeLastName); deed reference; legal description; subdivision
Not published	plat references
REST endpoint	`https://gis.rcgov.org/server/rest/services/OpenData/TaxParcels/FeatureServer/0`
Last verified	2026-10-20 with a live point and parcel-number query

FeatureServer from the joint Rapid City-Pennington County GIS office's open data folder. PIN is the 10-digit parcel number as text, e.g. '3701252018'; TaxID is the integer tax account (64570). PropAddress is the situs without city; Civil holds the municipality/township name. Owner is split into GranteeLastName (whole name for entities), Grantee1stName, Grantee2ndName; GranteeFullAddr/GranteeCity/GranteeZip are the owner mailing address. GranteeInstBook/GranteeInstPage are the vesting deed book/page (GranteeInstDate is MMDDYY text). Subdivision and LotNumber are space-padded.

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 South Dakota address, with LiDAR contours, soils, flood zones and wetlands.

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