THE WINNEBAGO COUNTY LAND BRIEF
Land in the
Rock River Drift Plain setting.
Winnebago County has 513 square miles of land in Illinois. 3 mapped landscape regions meet across Winnebago County: Rock River Drift Plain, Rock River Hills, Illinois/Indiana Prairies.
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.
Regional context: Southeastern Wisconsin Till Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Winnebago County intersects 3 mapped regional units. The largest mapped shares are:
- Rock River Drift Plain46.4%
- Rock River Hills38.8%
- Illinois/Indiana Prairies14.7%
Central Corn Belt Plains in Winnebago County
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.
Read the regional source ↗Finding your parcel within Winnebago County
The atlas lists 28 cities, towns, townships, and Census communities associated with Winnebago County, including Rockford, Rockford, Rockton. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Winnebago County by land and water
The Census records 6.13 square miles of water within Winnebago County, or 1.2% of its total area. That share is close to Winnebago County’s 1.2%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Winnebago County has 15.7 times the land area of nearby Burritt township (32.7 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Boone County, DeKalb County, Ogle County, Stephenson County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.

