THE JEFFERSON COUNTY LAND BRIEF
Land in the
Eastern Ozark Border setting.
Jefferson County has 656 square miles of land in Missouri. 4 mapped landscape regions meet across Jefferson County: Eastern Ozark Border, Meramec River Hills, River Hills, among others.
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.
Regional context: Ozark Highlands ↗ · Regional mapping across the county footprint
Where the landscape changes
Jefferson County intersects 4 mapped regional units. The largest mapped shares are:
- Eastern Ozark Border85.5%
- Meramec River Hills9.6%
- River Hills3.4%
- Middle Mississippi Alluvial Plain1.6%
Interior River Valleys and Hills in Jefferson County
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.
Read the regional source ↗Finding your parcel within Jefferson County
The atlas lists 26 cities, towns, townships, and Census communities associated with Jefferson County, including LaBarque Creek, Arnold, Eureka. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Jefferson County by land and water
The Census records 7.82 square miles of water within Jefferson County, or 1.2% of its total area. That share is close to Jefferson County’s 1.2%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Jefferson County has 170.7 times the land area of nearby Hillsboro city (3.84 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Franklin County, St. Francois County, St. Louis County, Ste. Genevieve County, Washington County within Missouri. A tract near one of these lines should be matched to the county identifier on its own records.

