THE DUPAGE COUNTY LAND BRIEF
Land in the
Valparaiso-Wheaton Morainal Complex setting.
DuPage County has 327.9 square miles of land in Illinois. 2 mapped landscape regions meet across DuPage County: Valparaiso-Wheaton Morainal Complex, Illinois/Indiana Prairies.
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
DuPage County intersects 2 mapped regional units. The largest mapped shares are:
- Valparaiso-Wheaton Morainal Complex98.4%
- Illinois/Indiana Prairies1.6%
Finding your parcel within DuPage County
The atlas lists 48 cities, towns, townships, and Census communities associated with DuPage County, including Chicago, Downers Grove, Aurora. The list includes overlapping geography types and does not divide the county into exclusive service areas.
DuPage County by land and water
The Census records 8.5 square miles of water within DuPage County, or 2.5% of its total area. That share is close to DuPage County’s 2.5%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, DuPage County has 9.5 times the land area of nearby Milton township (34.4 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Cook County, Kane County, Kendall County, Will County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.

