THE ALEXANDER COUNTY LAND BRIEF
Land in the
Northern Holocene Meander Belts setting.
Alexander County has 235.4 square miles of land in Illinois. 5 mapped landscape regions meet across Alexander County: Northern Holocene Meander Belts, Southern Ozarkian River Bluffs, Middle Mississippi Alluvial Plain, among others.
The Mississippi's broad alluvial plain includes river terraces, swales and natural levees. Small changes in elevation distinguish local settings within this generally flat river landscape.
Regional context: Mississippi Alluvial Plain ↗ · Regional mapping across the county footprint
Where the landscape changes
Alexander County intersects 5 mapped regional units. The largest mapped shares are:
- Northern Holocene Meander Belts38.8%
- Southern Ozarkian River Bluffs34.6%
- Middle Mississippi Alluvial Plain12.3%
- Wabash-Ohio Bottomlands8.8%
- Southern Shawnee Hills5.5%
Interior River Valleys and Hills in Alexander County
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.
Read the regional source ↗Interior Plateau in Alexander 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 Alexander County
The atlas lists 7 cities, towns, townships, and Census communities associated with Alexander County, including Olive Branch, Cairo, Tamms. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Alexander County by land and water
The Census records 17.2 square miles of water within Alexander County, or 6.8% of its total area. That share is close to Alexander County’s 6.8%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Alexander County has 335.8 times the land area of nearby Unity CDP (0.7 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Pulaski County, Union County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.

