South Dakota · FIPS 46017 · County seat: Gann Valley
Buffalo County, SD GIS & Parcel Viewer
Buffalo County, South Dakota parcel data lives on the Buffalo County planning-district WebGIS viewer. Open it below in a new tab, then use the short steps on this page to find a property fast.
Open the Buffalo County parcel map ↗
Opens gis.districtiii.org in a new tab. We link out and never embed or copy parcel data.
Buffalo County at a glance
| Official map | Buffalo County planning-district WebGIS viewer |
|---|---|
| Type | County-run map |
| Website | gis.districtiii.org |
| Access | Free, no login (checked Oct 2026) |
| County seat | Gann Valley |
| Population | 1,884 (2023 Census Bureau estimate) |
| Land area | 471 sq mi |
| FIPS code | 46017 |
Where the parcel data comes from
Buffalo County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. Our October 2026 check found the map open to the public, with no account or payment needed.
How to use the Buffalo County viewer
- Open the official link; the map is hosted on planning-district WebGIS, a vendor platform used by 43 counties in our directory.
- Accept any disclaimer, then use the search tool to find a street address, owner or parcel ID.
- Click a parcel to view its attributes.
- Use the layer or basemap controls to add aerials and other layers where the county provides them.
Many parcel sites expect owner names last name first. If a full name finds nothing, try just the surname.
Buffalo County by the numbers
The U.S. Census Bureau estimated Buffalo County's population at 1,884 in 2023, spread over about 471 square miles of land, or roughly 4.0 people per square mile. That makes it number 58 out of 66 South Dakota counties by population. Gann Valley serves as the county seat.
Nearby parcel maps
Parcels close to the edge of Buffalo County can fall in the next county over. Neighboring counties:
Maps vs. surveys
The lines you see online are approximate. They're good for finding a lot and its parcel number, but a legal boundary question needs the recorded plat or a surveyor.