THE MASSAC COUNTY LAND BRIEF
Land in the
Cretaceous Hills setting.
Massac County has 237.2 square miles of land in Illinois. 3 mapped landscape regions meet across Massac County: Cretaceous Hills, Wabash-Ohio Bottomlands, Southern Shawnee Hills.
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
Massac County intersects 3 mapped regional units. The largest mapped shares are:
- Cretaceous Hills51.7%
- Wabash-Ohio Bottomlands43%
- Southern Shawnee Hills5.3%
Interior Plateau in Massac 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 Massac County
The atlas lists 3 cities, towns, townships, and Census communities associated with Massac County, including Metropolis, Brookport, Joppa. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Massac County by land and water
The Census records 4.94 square miles of water within Massac County, or 2% of its total area. That share is close to Massac County’s 2%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Massac County has 39.5 times the land area of nearby Metropolis city (6.01 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Johnson County, Pope County, Pulaski County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.

