THE CLARK COUNTY LAND BRIEF
Land in the
Wabash River Bluffs and Low Hills setting.
Clark County has 501.4 square miles of land in Illinois. 4 mapped landscape regions meet across Clark County: Wabash River Bluffs and Low Hills, Southern Illinoian Till Plain, Wabash-Ohio Bottomlands, among others.
Broad terraced river valleys contrast with wooded slopes and dissected glacial plains. Bottomland settings and upland oak landscapes occur close together across the Interior River Valleys and Hills.
Regional context: Interior River Valleys and Hills ↗ · Regional mapping across the county footprint
Where the landscape changes
Clark County intersects 4 mapped regional units. The largest mapped shares are:
- Wabash River Bluffs and Low Hills47.4%
- Southern Illinoian Till Plain41%
- Wabash-Ohio Bottomlands7.5%
- Illinois/Indiana Prairies4.2%
Central Corn Belt Plains in Clark County
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.
Read the regional source ↗Finding your parcel within Clark County
The atlas lists 20 cities, towns, townships, and Census communities associated with Clark County, including Wabash, Martinsville, Orange. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Clark County by land and water
The Census records 3.37 square miles of water within Clark County, or 0.7% of its total area. That share is close to Clark County’s 0.7%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Clark County has 31.7 times the land area of nearby Auburn township (15.8 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Coles County, Crawford County, Cumberland County, Edgar County, Jasper County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.

