THE GRUNDY COUNTY LAND BRIEF
Land in the
Illinois/Indiana Prairies setting.
Grundy County has 418.1 square miles of land in Illinois. 2 mapped landscape regions meet across Grundy County: Illinois/Indiana Prairies, Sand Area.
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
Grundy County intersects 2 mapped regional units. The largest mapped shares are:
- Illinois/Indiana Prairies70.8%
- Sand Area29.2%
Finding your parcel within Grundy County
The atlas lists 34 cities, towns, townships, and Census communities associated with Grundy County, including Highland, Saratoga, Nettle Creek. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Grundy County by land and water
The Census records 12.4 square miles of water within Grundy County, or 2.9% of its total area. That share is close to Grundy County’s 2.9%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Grundy County has 15.6 times the land area of nearby Wauponsee township (26.8 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Kankakee County, Kendall County, LaSalle County, Livingston County, Will County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.

