- Alty Island
- Artificial Island
- Beach Plum Island
- Bell Memorial Chapel
- Big Bacon Island
- Big Cedar Island
- Big Nose Island
- Big Piney Island - historical
- Big Reedy Island
- Big Sheep Hammock
- Bombay Hook Island
- Bread and Cheese Island
- Burton Island - Frankford, Sussex County
- Burton Island - Bethany Beach, Sussex County
- Bush Island - Assawoman Bay, Sussex County
- Bush Island - Rehoboth Beach, Sussex County
- Cherry Island
- Cherrybush Island
- Cods Hammocks - historical
- Collins Island
- Coopers Island
- Fenwick Island
- First Hill
- Georges Island
- Gull Island
- Gum Island
- Hay Hummock
- Holly Island
- Hoods Island
- Horse Island - Fairmount, Sussex County
- Horse Island - Milton, Sussex County
- Ice Cream Island
- Island in the Narrows
- The Island - New Castle County
- The Island - Sussex County
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- Joseph Island
- Kelly Island
- Kent Island
- Kitts Hummock
- Little Bacon Island
- Little Cedar Island
- Little Reedy Island
- Little Sheep Hammock
- Marsh Island - Fairmount, Sussex County
- Marsh Island - historical - Assawoman Bay, Sussex County
- Marshall Island
- Middle Island
- Morgan Island
- Island in the Narrows
- Needhams Island
- Negro Island
- Oak Hill
- Pea Patch Island
- Petersfield Island
- Point of Cedars Island
- Prickley Pear Island
- Ragged Island
- Rawley Island
- Reedy Island - New Castle County
- Reedy Island - Sussex County
- Robs Island
- The Rocks
- Sand Island
- Seal Island
- Second Hill
- Sheppards Island
- Thompson Island
- Todds Island
- Vansant Island
- Wall Island
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