THE ONSLOW COUNTY LAND BRIEF
Land in the
Carolina Flatwoods setting.
Onslow County has 762.1 square miles of land in North Carolina. 3 mapped landscape regions meet across Onslow County: Carolina Flatwoods, Swamps and Peatlands, Carolinian Barrier Islands and Coastal Marshes.
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
Onslow County intersects 3 mapped regional units. The largest mapped shares are:
- Carolina Flatwoods88.5%
- Swamps and Peatlands8.6%
- Carolinian Barrier Islands and Coastal Marshes2.9%
Finding your parcel within Onslow County
The atlas lists 10 cities, towns, townships, and Census communities associated with Onslow County, including Jacksonville, Piney Green, Surf City. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Onslow County by land and water
The Census records 143.1 square miles of water within Onslow County, or 15.8% of its total area. That share is close to Onslow County’s 15.8%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Onslow County has 103.1 times the land area of nearby Half Moon CDP (7.39 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Carteret County, Duplin County, Jones County, Pender County within North Carolina. A tract near one of these lines should be matched to the county identifier on its own records.

