Sussex County Delaware (Vacant / Not In Use) has 16 places on the National Register of Historic Places including 4 places of National significance and 7 places of Statewide significance. Significant places include Fort Miles Historic District, Old Sussex County Courthouse, Prince George's Chapel, Roosevelt Inlet Shipwreck and Abbott's Mill.
The famous person Gov. William H. Ross is associated with one of more of the Sussex County historic places. Prominent architectural styles found in Sussex Country are Italianate, Colonial Revival and Federal.