THE PRAIRIE DU LONG LAND BRIEF
Land in the
Southern Illinoian Till Plain setting.
Prairie Du Long township has 35.5 square miles of land in St. Clair County. Its Census reference point is in Southern Illinoian Till Plain, within Interior River Valleys and 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 ↗ · Classification at the Census reference point
Prairie Du Long and St. Clair County
Prairie Du Long is associated with St. Clair County in the Census boundary data. Start with the parcel’s tax bill to match the property to that jurisdiction, then confirm which government handles its land use.
Prairie Du Long by land and water
The Census records 0.44 square miles of water within Prairie Du Long, or 1.2% of its total area. It is 1.2 percentage points lower than the 2.4% recorded for St. Clair County. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Prairie Du Long township has 236.4 times the land area of nearby Paderborn CDP (0.15 square miles). These areas describe boundaries, not comparable property prices.

