THE SIOUX COUNTY LAND BRIEF
Land in the
Missouri Plateau setting.
Sioux County has 1,094.1 square miles of land in North Dakota. 3 mapped landscape regions meet across Sioux County: Missouri Plateau, Moreau Prairie, River Breaks.
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
Sioux County intersects 3 mapped regional units. The largest mapped shares are:
- Missouri Plateau70.5%
- Moreau Prairie21.9%
- River Breaks7.5%
Finding your parcel within Sioux County
The atlas lists 6 cities, towns, townships, and Census communities associated with Sioux County, including Cannon Ball, Menz, Solen. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Sioux County by land and water
The Census records 34.2 square miles of water within Sioux County, or 3% of its total area. That share is close to Sioux County’s 3%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Sioux County has 5,416.1 times the land area of nearby Porcupine CDP (0.2 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Adams County, Emmons County, Grant County, Morton County within North Dakota. A tract near one of these lines should be matched to the county identifier on its own records.

