South Dakota · FIPS 46091 · County seat: Britton
Marshall County, SD GIS & Parcel Viewer
Here is the direct link to the county parcel map covering Marshall County, SD: the Marshall County planning-district WebGIS viewer. Below you'll find basic facts about the county, steps for using the viewer, and nearby counties.
Open the Marshall 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 | Marshall County planning-district WebGIS viewer |
|---|---|
| Type | County-run map |
| Website | gis.districtiii.org |
| Access | Free, no login (checked Oct 2026) |
| County seat | Britton |
| Population | 4,390 (2023 Census Bureau estimate) |
| Land area | 838 sq mi |
| FIPS code | 46091 |
Who runs this map
It is a county-level map: Marshall County or the company it hires keeps the parcel layer up to date. As of our October 2026 test, anyone could open it without signing in or paying.
How to use the Marshall 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.
If an address search comes up empty, try the parcel number from a tax bill or deed instead, or click the lot on the map.
Marshall County by the numbers
Marshall County had an estimated 4,390 residents in 2023, according to the Census Bureau. With about 838 square miles of land, that works out to roughly 5.2 people per square mile. By population it ranks 37th of 66 counties in South Dakota. Britton serves as the county seat.
Nearby parcel maps
Parcels close to the edge of Marshall County can fall in the next county over. Neighboring counties:
Before you rely on the lines
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.