South Dakota · FIPS 46119 · County seat: Onida
Sully County, SD GIS & Parcel Viewer
Parcel lookups for Sully County start at the Sully County planning-district WebGIS viewer. This page gives you that official link, notes on how the viewer works, and links to the counties next door.
Open the Sully County parcel map ↗
Opens gis.districtiii.org in a new tab. We link out and never embed or copy parcel data.
Quick facts
| Official map | Sully County planning-district WebGIS viewer |
|---|---|
| Type | County-run map |
| Website | gis.districtiii.org |
| Access | Free, no login (checked Oct 2026) |
| County seat | Onida |
| Population | 1,494 (2023 Census Bureau estimate) |
| Land area | 1,007 sq mi |
| FIPS code | 46119 |
Where the parcel data comes from
Sully County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. As of our October 2026 test, anyone could open it without signing in or paying.
How to use the Sully County viewer
- Press the button above. This county's viewer runs on planning-district WebGIS; 43 counties in our directory use the same service.
- Find the search option and look up a property, or zoom in on the map.
- Click a lot to see its details.
- Check the toolbar for layers, measuring and printing.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
About Sully County
Sully County had an estimated 1,494 residents in 2023, according to the Census Bureau. With about 1,007 square miles of land, that works out to roughly 1.5 people per square mile. Among South Dakota's 66 counties, it is the 62nd largest by population. Its county seat is Onida.
Nearby parcel maps
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Sully County:
Maps vs. surveys
Treat the map as a guide, not a boundary survey: parcel outlines are often shifted a bit from the real corners. A licensed surveyor settles exact lines.