THE ILLINOIS LAND BRIEF
Land in the
Drift Plains setting.
Illinois township has 35 square miles of land in Nelson County. Its Census reference point is in Drift Plains, within Northern Glaciated Plains.
Flat to gently rolling glacial terrain supports a prairie transition between taller and shorter grasses. Many temporary and seasonal wetlands occupy depressions left in the glacial landscape.
Regional context: Northern Glaciated Plains ↗ · Classification at the Census reference point
Illinois and Nelson County
Illinois is associated with Nelson County in the Census boundary data. Start with the parcel’s tax bill to match the property to that jurisdiction, then confirm which government handles its land use.
Illinois by land and water
The Census records 1.23 square miles of water within Illinois, or 3.4% of its total area. It is 0.7 percentage points higher than the 2.7% recorded for Nelson County. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Illinois township has 1.1 times the land area of nearby Leval township (31.8 square miles). These areas describe boundaries, not comparable property prices.

