THE MARION COUNTY LAND BRIEF
Land in the
Mid-Atlantic Floodplains and Low Terraces setting.
Marion County has 489.4 square miles of land in South Carolina. 3 mapped landscape regions meet across Marion County: Mid-Atlantic Floodplains and Low Terraces, Atlantic Southern Loam Plains, Southeastern Floodplains and Low Terraces.
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.
Regional context: Middle Atlantic Coastal Plain ↗ · Regional mapping across the county footprint
Where the landscape changes
Marion County intersects 3 mapped regional units. The largest mapped shares are:
- Mid-Atlantic Floodplains and Low Terraces40.3%
- Atlantic Southern Loam Plains34.2%
- Southeastern Floodplains and Low Terraces25.5%
Southeastern Plains in Marion County
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.
Read the regional source ↗Finding your parcel within Marion County
The atlas lists 8 cities, towns, townships, and Census communities associated with Marion County, including Marion, Mullins, Nichols. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Marion County by land and water
The Census records 4.8 square miles of water within Marion County, or 1% of its total area. That share is close to Marion County’s 1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Marion County has 366.3 times the land area of nearby Rains CDP (1.34 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Dillon County, Florence County, Georgetown County, Horry County, Williamsburg County within South Carolina. A tract near one of these lines should be matched to the county identifier on its own records.

