THE ST. LOUIS COUNTY LAND BRIEF
Land in the
River Hills setting.
St. Louis County has 508.5 square miles of land in Missouri. 3 mapped landscape regions meet across St. Louis County: River Hills, Eastern Ozark Border, Middle Mississippi Alluvial 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
Where the landscape changes
St. Louis County intersects 3 mapped regional units. The largest mapped shares are:
- River Hills66.7%
- Eastern Ozark Border27.4%
- Middle Mississippi Alluvial Plain5.8%
Ozark Highlands in St. Louis County
Wooded uplands over limestone, dolomite and sandstone characterize the Ozarks. Springs, caves and spring-fed streams are widespread regional features within a landscape of uneven plateaus and valleys.
Read the regional source ↗Finding your parcel within St. Louis County
The atlas lists 98 cities, towns, townships, and Census communities associated with St. Louis County, including Wildwood, Chesterfield, Maryland Heights. The list includes overlapping geography types and does not divide the county into exclusive service areas.
St. Louis County by land and water
The Census records 15.4 square miles of water within St. Louis County, or 2.9% of its total area. That share is close to St. Louis County’s 2.9%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, St. Louis County has 808.5 times the land area of nearby Westwood village (0.63 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Franklin County, Jefferson County, St. Charles County, St. Louis city within Missouri. A tract near one of these lines should be matched to the county identifier on its own records.

