THE WILMINGTON LAND BRIEF
Land in the
Delaware River Terraces and Uplands setting.
Wilmington city has 10.9 square miles of land in New Castle County. Its Census reference point is in Delaware River Terraces and Uplands, within Middle Atlantic Coastal Plain.
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 ↗ · Classification at the Census reference point
Wilmington and New Castle County
Wilmington is associated with New Castle County in the Census boundary data. Start with the parcel’s tax bill to match the property to that jurisdiction, then confirm which government handles its land use.
Wilmington by land and water
The Census records 6.3 square miles of water within Wilmington, or 36.6% of its total area. It is 22.9 percentage points higher than the 13.7% recorded for New Castle County. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Wilmington city has 5.7 times the land area of nearby Edgemoor CDP (1.91 square miles). These areas describe boundaries, not comparable property prices.

