THE HENDERSON COUNTY LAND BRIEF
Land in the
Western Dissected Illinoian Till Plain setting.
Henderson County has 378.8 square miles of land in Illinois. 3 mapped landscape regions meet across Henderson County: Western Dissected Illinoian Till Plain, Upper Mississippi Alluvial Plain, River 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
Henderson County intersects 3 mapped regional units. The largest mapped shares are:
- Western Dissected Illinoian Till Plain39.2%
- Upper Mississippi Alluvial Plain32%
- River Hills28.9%
Finding your parcel within Henderson County
The atlas lists 21 cities, towns, townships, and Census communities associated with Henderson County, including Gladstone, Bald Bluff, Biggsville. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Henderson County by land and water
The Census records 16.4 square miles of water within Henderson County, or 4.2% of its total area. That share is close to Henderson County’s 4.2%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Henderson County has 8.1 times the land area of nearby Gladstone township (46.8 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Hancock County, McDonough County, Mercer County, Warren County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.

