THE DOUGLAS COUNTY LAND BRIEF
Land in the
Southern Missouri Coteau setting.
Douglas County has 431.8 square miles of land in South Dakota. 3 mapped landscape regions meet across Douglas County: Southern Missouri Coteau, Southern Missouri Coteau Slope, James River Lowland.
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
Douglas County intersects 3 mapped regional units. The largest mapped shares are:
- Southern Missouri Coteau67.7%
- Southern Missouri Coteau Slope28.5%
- James River Lowland3.7%
Northern Glaciated Plains in Douglas County
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.
Read the regional source ↗Finding your parcel within Douglas County
The atlas lists 20 cities, towns, townships, and Census communities associated with Douglas County, including Valley, Independence, Iowa. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Douglas County by land and water
The Census records 1.87 square miles of water within Douglas County, or 0.4% of its total area. That share is close to Douglas County’s 0.4%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Douglas County has 12.5 times the land area of nearby Grandview township (34.6 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Aurora County, Charles Mix County, Davison County, Hutchinson County within South Dakota. A tract near one of these lines should be matched to the county identifier on its own records.

