THE JACKSON COUNTY LAND BRIEF
Land in the
Southern Illinoian Till Plain setting.
Jackson County has 583.6 square miles of land in Illinois. 6 mapped landscape regions meet across Jackson County: Southern Illinoian Till Plain, Middle Mississippi Alluvial Plain, Northern Shawnee Hills, 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
Jackson County intersects 6 mapped regional units. The largest mapped shares are:
- Southern Illinoian Till Plain60.1%
- Middle Mississippi Alluvial Plain18.2%
- Northern Shawnee Hills7.9%
- Southern Ozarkian River Bluffs7.4%
- Karstic Northern Ozarkian River Bluffs5.7%
Interior Plateau in Jackson County
Open hills, irregular plains and tablelands are developed on limestone and other sedimentary rocks. Oak-hickory woodland, local prairie and cedar-glade settings contribute to this diverse inland plateau.
Read the regional source ↗Finding your parcel within Jackson County
The atlas lists 28 cities, towns, townships, and Census communities associated with Jackson County, including Pomona, Bradley, Carbondale. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Jackson County by land and water
The Census records 18.7 square miles of water within Jackson County, or 3.1% of its total area. That share is close to Jackson County’s 3.1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Jackson County has 276.7 times the land area of nearby Harrison CDP (2.11 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Franklin County, Perry County, Randolph County, Union County, Williamson County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.

