THE RANDOLPH COUNTY LAND BRIEF
Land in the
Southern Illinoian Till Plain setting.
Randolph County has 575.4 square miles of land in Illinois. 3 mapped landscape regions meet across Randolph County: Southern Illinoian Till Plain, Karstic Northern Ozarkian River Bluffs, Middle Mississippi Alluvial Plain.
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
Randolph County intersects 3 mapped regional units. The largest mapped shares are:
- Southern Illinoian Till Plain55.8%
- Karstic Northern Ozarkian River Bluffs28.9%
- Middle Mississippi Alluvial Plain15.2%
Finding your parcel within Randolph County
The atlas lists 14 cities, towns, townships, and Census communities associated with Randolph County, including Sparta, Chester, Red Bud. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Randolph County by land and water
The Census records 21.7 square miles of water within Randolph County, or 3.6% of its total area. That share is close to Randolph County’s 3.6%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Randolph County has 1,171.8 times the land area of nearby Ellis Grove village (0.49 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Jackson County, Monroe County, Perry County, St. Clair County, Washington County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.

