THE PENNINGTON COUNTY LAND BRIEF
Land in the
Semiarid Pierre Shale Plains setting.
Pennington County has 2,776.8 square miles of land in South Dakota. 7 mapped landscape regions meet across Pennington County: Semiarid Pierre Shale Plains, Subhumid Pierre Shale Plains, White River Badlands, among others.
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.
Regional context: Northwestern Great Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Pennington County intersects 7 mapped regional units. The largest mapped shares are:
- Semiarid Pierre Shale Plains23.3%
- Subhumid Pierre Shale Plains18.2%
- White River Badlands16.2%
- Black Hills Plateau14.6%
- River Breaks13.1%
Middle Rockies in Pennington County
Forested mountain ranges rise above grassy or shrubby intermountain valleys. The Middle Rockies combine alpine high country, partly wooded foothills and valleys supplied by mountain streams.
Read the regional source ↗Finding your parcel within Pennington County
The atlas lists 35 cities, towns, townships, and Census communities associated with Pennington County, including Scenic, Imlay, Rainy Creek/Cheyenne. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Pennington County by land and water
The Census records 7.69 square miles of water within Pennington County, or 0.3% of its total area. That share is close to Pennington County’s 0.3%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Pennington County has 1,669.7 times the land area of nearby New Underwood city (1.66 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Custer County, Haakon County, Jackson County, Lawrence County, Meade County, Oglala Lakota County within South Dakota. A tract near one of these lines should be matched to the county identifier on its own records.

