THE PORTAGE DES SIOUX LAND BRIEF
Land in the
Upper Mississippi Alluvial Plain setting.
Portage Des Sioux city has 0.58 square miles of land in St. Charles County. Its Census reference point is in Upper 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
Portage Des Sioux and St. Charles County
Portage Des Sioux is associated with St. Charles 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.
Portage Des Sioux by land and water
The Census records 0.1 square miles of water within Portage Des Sioux, or 14.8% of its total area. It is 9.4 percentage points higher than the 5.4% recorded for St. Charles County. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Portage Des Sioux city has 3.8% of the land area of nearby Old Jamestown CDP (14.9 square miles). These areas describe boundaries, not comparable property prices.

