THE HAMILTON COUNTY LAND BRIEF
Land in the
Southern Illinoian Till Plain setting.
Hamilton County has 434.7 square miles of land in Illinois. 2 mapped landscape regions meet across Hamilton County: Southern Illinoian Till Plain, Wabash-Ohio Bottomlands.
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
Hamilton County intersects 2 mapped regional units. The largest mapped shares are:
- Southern Illinoian Till Plain77.8%
- Wabash-Ohio Bottomlands22.2%
Finding your parcel within Hamilton County
The atlas lists 17 cities, towns, townships, and Census communities associated with Hamilton County, including Mayberry, Dahlgren, Crouch. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Hamilton County by land and water
The Census records 1.22 square miles of water within Hamilton County, or 0.3% of its total area. That share is close to Hamilton County’s 0.3%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Hamilton County has 160.8 times the land area of nearby McLeansboro city (2.7 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Franklin County, Gallatin County, Jefferson County, Saline County, Wayne County, White County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.