THE MARION COUNTY LAND BRIEF
Land in the
Southern Illinoian Till Plain setting.
Marion County has 572.5 square miles of land in Illinois. The mapped landscape region in Marion County is Southern Illinoian Till 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
Finding your parcel within Marion County
The atlas lists 32 cities, towns, townships, and Census communities associated with Marion County, including Alma, Stevenson, Kinmundy. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Marion County by land and water
The Census records 3.57 square miles of water within Marion County, or 0.6% of its total area. That share is close to Marion County’s 0.6%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Marion County has 81.9 times the land area of nearby Salem city (6.99 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Clay County, Clinton County, Fayette County, Jefferson County, Washington County, Wayne County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.

