THE FRANKLIN COUNTY LAND BRIEF
Land in the
Southern Illinoian Till Plain setting.
Franklin County has 408.9 square miles of land in Illinois. The mapped landscape region in Franklin 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 Franklin County
The atlas lists 29 cities, towns, townships, and Census communities associated with Franklin County, including Northern, Frankfort, Six Mile. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Franklin County by land and water
The Census records 22.5 square miles of water within Franklin County, or 5.2% of its total area. That share is close to Franklin County’s 5.2%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Franklin County has 254.3 times the land area of nearby West City village (1.61 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Hamilton County, Jackson County, Jefferson County, Perry County, Saline County, Williamson County within Illinois. A tract near one of these lines should be matched to the county identifier on its own records.

