THE CHARLESTON COUNTY LAND BRIEF
Land in the
Sea Islands/Coastal Marsh setting.
Charleston County has 918.1 square miles of land in South Carolina. 3 mapped landscape regions meet across Charleston County: Sea Islands/Coastal Marsh, Carolina Flatwoods, Mid-Atlantic Floodplains and Low Terraces.
Low plains mingle with barrier islands, lagoons, marshes and inland lake districts. Coastal and inland settings vary substantially within this warm southeastern landscape.
Regional context: Southern Coastal Plain ↗ · Regional mapping across the county footprint
Where the landscape changes
Charleston County intersects 3 mapped regional units. The largest mapped shares are:
- Sea Islands/Coastal Marsh73.1%
- Carolina Flatwoods26.3%
- Mid-Atlantic Floodplains and Low Terraces0.7%
Middle Atlantic Coastal Plain in Charleston 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 ↗Finding your parcel within Charleston County
The atlas lists 19 cities, towns, townships, and Census communities associated with Charleston County, including Charleston, North Charleston, Mount Pleasant. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Charleston County by land and water
The Census records 448.8 square miles of water within Charleston County, or 32.8% of its total area. That share is close to Charleston County’s 32.8%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Charleston County has 8 times the land area of nearby Charleston city (115.3 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Berkeley County, Colleton County, Dorchester County, Georgetown County within South Carolina. A tract near one of these lines should be matched to the county identifier on its own records.

