THE WINNEBAGO COUNTY LAND BRIEF
Land in the
Lake Michigan Lacustrine Clay Plain setting.
Winnebago County has 434.7 square miles of land in Wisconsin. 3 mapped landscape regions meet across Winnebago County: Lake Michigan Lacustrine Clay Plain, Southeastern Wisconsin Savannah and Till Plain, Green Bay Till and Lacustrine Plain.
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:
- Lake Michigan Lacustrine Clay Plain84.9%
- Southeastern Wisconsin Savannah and Till Plain14.1%
- Green Bay Till and Lacustrine Plain1%
North Central Hardwood Forests in Winnebago County
This transition between northern forests and southern farming country includes lakes, wetlands and hardwood woodland. Glacial landforms support a mosaic of open land and wooded areas.
Read the regional source ↗Finding your parcel within Winnebago County
The atlas lists 26 cities, towns, townships, and Census communities associated with Winnebago County, including Clayton, Utica, Winchester. 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 143.9 square miles of water within Winnebago County, or 24.9% of its total area. That share is close to Winnebago County’s 24.9%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Winnebago County has 352.3 times the land area of nearby Butte des Morts CDP (1.23 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Calumet County, Fond du Lac County, Green Lake County, Outagamie County, Waupaca County, Waushara County within Wisconsin. A tract near one of these lines should be matched to the county identifier on its own records.

