THE WALWORTH COUNTY LAND BRIEF
Land in the
Southern Missouri Coteau Slope setting.
Walworth County has 707.5 square miles of land in South Dakota. 3 mapped landscape regions meet across Walworth County: Southern Missouri Coteau Slope, River Breaks, Missouri Coteau.
Glaciated plains bridge the wetter eastern prairie and the drier, more broken Great Plains. Numerous prairie potholes and other seasonal or persistent wetlands are characteristic regional landforms.
Regional context: Northwestern Glaciated Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Walworth County intersects 3 mapped regional units. The largest mapped shares are:
- Southern Missouri Coteau Slope72%
- River Breaks19.3%
- Missouri Coteau8.7%
Northwestern Great Plains in Walworth County
Rolling semiarid plains are punctuated by buttes, badlands and river breaks. Much of the regional terrain developed on sandstone, siltstone and shale without the leveling influence of continental glaciers.
Read the regional source ↗Finding your parcel within Walworth County
The atlas lists 6 cities, towns, townships, and Census communities associated with Walworth County, including Mobridge, Selby, Akaska. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Walworth County by land and water
The Census records 37.2 square miles of water within Walworth County, or 5% of its total area. That share is close to Walworth County’s 5%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Walworth County has 993.6 times the land area of nearby Selby city (0.71 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Campbell County, Corson County, Dewey County, Edmunds County, McPherson County, Potter County within South Dakota. A tract near one of these lines should be matched to the county identifier on its own records.

