THE DAY COUNTY LAND BRIEF
Land in the
Prairie Coteau setting.
Day County has 1,028.5 square miles of land in South Dakota. 4 mapped landscape regions meet across Day County: Prairie Coteau, Drift Plains, Glacial Lake Basins, 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
Day County intersects 4 mapped regional units. The largest mapped shares are:
- Prairie Coteau83.5%
- Drift Plains13.5%
- Glacial Lake Basins1.8%
- Big Sioux Basin1.2%
Finding your parcel within Day County
The atlas lists 37 cities, towns, townships, and Census communities associated with Day County, including Andover, Waubay, Egeland. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Day County by land and water
The Census records 62.6 square miles of water within Day County, or 5.7% of its total area. That share is close to Day County’s 5.7%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Day County has 30.9 times the land area of nearby Webster township (33.3 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Brown County, Clark County, Codington County, Grant County, Marshall County, Roberts County, Spink County within South Dakota. A tract near one of these lines should be matched to the county identifier on its own records.

