THE ROBERTS COUNTY LAND BRIEF
Land in the
Minnesota River Prairie setting.
Roberts County has 1,101.1 square miles of land in South Dakota. 7 mapped landscape regions meet across Roberts County: Minnesota River Prairie, Tewaukon/Big Stone Stagnation Moraine, Prairie Coteau, among others.
Flat to gently rolling glacial terrain supports a prairie transition between taller and shorter grasses. Many temporary and seasonal wetlands occupy depressions left in the glacial landscape.
Regional context: Northern Glaciated Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Roberts County intersects 7 mapped regional units. The largest mapped shares are:
- Minnesota River Prairie38%
- Tewaukon/Big Stone Stagnation Moraine28.6%
- Prairie Coteau11.3%
- Prairie Coteau Escarpment10.8%
- Big Sioux Basin5.8%
Lake Agassiz Plain in Roberts County
The former bed of glacial Lake Agassiz forms an exceptionally flat plain in the Red River valley. Thick lake sediments overlie older glacial deposits across this historic prairie landscape.
Read the regional source ↗Finding your parcel within Roberts County
The atlas lists 44 cities, towns, townships, and Census communities associated with Roberts County, including Harmon, White Rock, Norway. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Roberts County by land and water
The Census records 34.7 square miles of water within Roberts County, or 3.1% of its total area. That share is close to Roberts County’s 3.1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Roberts County has 33 times the land area of nearby Easter township (33.4 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Day County, Grant County, Marshall County within South Dakota. A tract near one of these lines should be matched to the county identifier on its own records.

