THE DUPO LAND BRIEF
Land in the
Middle Mississippi Alluvial Plain setting.
Dupo village has 6.4 square miles of land in Monroe County, St. Clair County. Its Census reference point is in Middle Mississippi Alluvial 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
One place name. 2 county geographies.
Dupo intersects 2 county geographies: Monroe County, St. Clair County. A Dupo mailing address alone cannot choose the right record office; use the county and parcel identifier on the tax bill or deed.
Dupo by land and water
The Census records 0.02 square miles of water within Dupo, or 0.3% of its total area. It is 3.8 percentage points lower than the 4.1% recorded for Illinois. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Dupo village has 20.9% of the land area of nearby Sugar Loaf township (30.6 square miles). These areas describe boundaries, not comparable property prices.

