THE ALLENDALE COUNTY LAND BRIEF
Land in the
Atlantic Southern Loam Plains setting.
Allendale County has 408.1 square miles of land in South Carolina. 6 mapped landscape regions meet across Allendale County: Atlantic Southern Loam Plains, Carolina Flatwoods, Southeastern Floodplains and Low Terraces, among others.
Irregular plains of sand, silt and clay support a mix of pine and hardwood landscapes. The region has more relief than the lower coastal plain, with generally gentle stream gradients.
Regional context: Southeastern Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Allendale County intersects 6 mapped regional units. The largest mapped shares are:
- Atlantic Southern Loam Plains61.9%
- Carolina Flatwoods24.4%
- Southeastern Floodplains and Low Terraces8.8%
- Floodplains and Low Terraces4.2%
- Sand Hills0.5%
Middle Atlantic Coastal Plain in Allendale County
Low coastal plains contain terraces, estuaries, marshes and barrier islands. Unconsolidated sediments underlie this varied coastal setting, with forest patterns changing near streams and low-lying areas.
Read the regional source ↗Southern Coastal Plain in Allendale County
Low plains mingle with barrier islands, lagoons, marshes and inland lake districts. Coastal and inland settings vary substantially within this warm southeastern landscape.
Read the regional source ↗Finding your parcel within Allendale County
The atlas lists 4 cities, towns, townships, and Census communities associated with Allendale County, including Fairfax, Allendale, Sycamore. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Allendale County by land and water
The Census records 4.32 square miles of water within Allendale County, or 1% of its total area. That share is close to Allendale County’s 1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Allendale County has 123.3 times the land area of nearby Allendale town (3.31 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Bamberg County, Barnwell County, Colleton County, Hampton County within South Carolina. A tract near one of these lines should be matched to the county identifier on its own records.

