THE BOONE COUNTY LAND BRIEF
Land in the
Illinois/Indiana Prairies setting.
Boone County has 280.7 square miles of land in Illinois. 2 mapped landscape regions meet across Boone County: Illinois/Indiana Prairies, Rock River Drift Plain.
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
Boone County intersects 2 mapped regional units. The largest mapped shares are:
- Illinois/Indiana Prairies54.1%
- Rock River Drift Plain45.9%
Southeastern Wisconsin Till Plains in Boone 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 ↗Finding your parcel within Boone County
The atlas lists 19 cities, towns, townships, and Census communities associated with Boone County, including Flora, Belvidere, Spring. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Boone County by land and water
The Census records 1.29 square miles of water within Boone County, or 0.5% of its total area. That share is close to Boone County’s 0.5%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Boone County has 160.8 times the land area of nearby Timberlane village (1.75 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets DeKalb County, McHenry 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.

