THE BROOKINGS COUNTY LAND BRIEF
Land in the
Big Sioux Basin setting.
Brookings County has 792.2 square miles of land in South Dakota. 2 mapped landscape regions meet across Brookings County: Big Sioux Basin, Prairie Coteau.
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
Brookings County intersects 2 mapped regional units. The largest mapped shares are:
- Big Sioux Basin68.5%
- Prairie Coteau31.5%
Finding your parcel within Brookings County
The atlas lists 36 cities, towns, townships, and Census communities associated with Brookings County, including Eureka, Argo, Oak Lake. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Brookings County by land and water
The Census records 12.7 square miles of water within Brookings County, or 1.6% of its total area. That share is close to Brookings County’s 1.6%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Brookings County has 22.4 times the land area of nearby Sterling township (35.4 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Deuel County, Hamlin County, Kingsbury County, Lake County, Moody County within South Dakota. A tract near one of these lines should be matched to the county identifier on its own records.

