THE DECATUR COUNTY LAND BRIEF
Land in the
Loamy High Lime Till Plains setting.
Decatur County has 372.6 square miles of land in Indiana. 2 mapped landscape regions meet across Decatur County: Loamy High Lime Till Plains, Pre-Wisconsinan Drift Plains.
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
Decatur County intersects 2 mapped regional units. The largest mapped shares are:
- Loamy High Lime Till Plains70.4%
- Pre-Wisconsinan Drift Plains29.6%
Finding your parcel within Decatur County
The atlas lists 23 cities, towns, townships, and Census communities associated with Decatur County, including Marion, Washington, Clay. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Decatur County by land and water
The Census records 0.76 square miles of water within Decatur County, or 0.2% of its total area. That share is close to Decatur County’s 0.2%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Decatur County has 6.8 times the land area of nearby Washington township (55.1 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Bartholomew County, Franklin County, Jennings County, Ripley County, Rush County, Shelby County within Indiana. A tract near one of these lines should be matched to the county identifier on its own records.

