THE STEPHENSON COUNTY LAND BRIEF
Land in the
Rock River Hills setting.
Stephenson County has 564.2 square miles of land in Illinois. 3 mapped landscape regions meet across Stephenson County: Rock River Hills, Rock River Drift Plain, Savanna Section.
Glaciated plains historically supported tallgrass prairie mixed with oak and hickory woodland. Dark prairie soils and broad farming landscapes distinguish much of the Central Corn Belt.
Regional context: Central Corn Belt Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Stephenson County intersects 3 mapped regional units. The largest mapped shares are:
- Rock River Hills57.1%
- Rock River Drift Plain42%
- Savanna Section0.9%
Southeastern Wisconsin Till Plains in Stephenson County
Glacial till plains support a transition between hardwood forest, oak savanna and prairie landscapes. Rolling farmland and woodland reflect this meeting of ecological regions in southeastern Wisconsin.
Read the regional source ↗Driftless Area in Stephenson County
Deeply cut valleys divide a bedrock plateau with windblown soil on many uplands. Glaciers had less influence here than in neighboring regions, leaving a distinctly hilly landscape.
Read the regional source ↗Finding your parcel within Stephenson County
The atlas lists 31 cities, towns, townships, and Census communities associated with Stephenson County, including Ridott, Rock Run, Buckeye. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Stephenson County by land and water
The Census records 0.52 square miles of water within Stephenson County, or 0.1% of its total area. That share is close to Stephenson County’s 0.1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Stephenson County has 206.5 times the land area of nearby Willow Lake CDP (2.73 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Carroll County, Jo Daviess County, Ogle County, Winnebago County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.

