THE DEKALB COUNTY LAND BRIEF
Land in the
Clayey High Lime Till Plains setting.
DeKalb County has 362.8 square miles of land in Indiana. 2 mapped landscape regions meet across DeKalb County: Clayey High Lime Till Plains, Northern Indiana Lake Country.
Rolling glacial till plains are interrupted by end moraines and areas of older, more dissected deposits. The historical landscape had more tree cover than the Central Corn Belt to the west.
Regional context: Eastern Corn Belt Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
DeKalb County intersects 2 mapped regional units. The largest mapped shares are:
- Clayey High Lime Till Plains90.2%
- Northern Indiana Lake Country9.8%
Southern Michigan/Northern Indiana Drift Plains in DeKalb County
Lakes, marshes and complex glacial deposits create a varied landscape around southern Michigan and northern Indiana. Moraines, beach ridges, dunes, kettles and meltwater channels occur across the region.
Read the regional source ↗Finding your parcel within DeKalb County
The atlas lists 25 cities, towns, townships, and Census communities associated with DeKalb County, including Wilmington, Fairfield, Jackson. The list includes overlapping geography types and does not divide the county into exclusive service areas.
DeKalb County by land and water
The Census records 1.03 square miles of water within DeKalb County, or 0.3% of its total area. That share is close to DeKalb County’s 0.3%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, DeKalb County has 20.4 times the land area of nearby Union township (17.8 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Allen County, LaGrange County, Noble County, Steuben County within Indiana. A tract near one of these lines should be matched to the county identifier on its own records.

