Delaware - Significance region: National
| Archeological Site K-873 (7K-D-35/A, B and D) |
| Archeological Site K-875 (7K-D-37/C) |
| Archeological Site K-876 (7K-D-38/C) |
| Archeological Site K-880 (7K-D-42/F) |
| Archeological Site K-891 (7K-D-45/A and B) |
| Archeological Site K-913 (7K-D-47/C, D and E) |
| Archeological Site K-914 (7K-D-48/F and G) |
| Archeological Site K-915 (7K-D-86/C) |
| Archeological Site K-916 (7K-D-49/C) |
| Archeological Site K-920 (7K-D-52/A and C) |
| Archmere |
| Ardens Historic District |
| Aspendale |
| Barratt's Chapel |
| Bridgeville Historic District |
| Broom, Jacob, House |
| Buena Vista |
| Byfield Historic District |
| Corbit-Sharp House |
| Darley House |
| Delaware Breakwater and Lewes Harbor |
| Dickinson, John, House |
| Eleutherian Mills |
| First Broiler House |
| Fort Christina |
| Fort Miles Historic District |
| Fourteen Foot Bank Light |
| Gibraltar |
| Harlan and Hollingsworth Office Building |
| Holy Trinity |
| Lightship WLV 539 |
| Liston Range Rear Light Station |
| Logan School House K-834 |
| Lombardy Hall |
| Lower St. Jones Neck Historic District |
| MacDonough, Comdr. Thomas, House |
| National Harbor of Refuge and Delaware Breakwater Harbor Historic District |
| New Castle and Frenchtown Railroad Right-of-Way |
| New Castle County Court House |
| New Castle Historic District |
| New Castle Historic District |
| Odessa Historic District |
| Old Customshouse |
| Old Statehouse |
| Old Sussex County Courthouse |
| Old Town Hall |
| Prince George's Chapel |
| Pyle, Howard, Studios |
| Reading, Philip, Tannery |
| Roosevelt Inlet Shipwreck |
| State Theater |
| Stonum |
| Winterthur Museum and Gardens |
Data from United States Park Service and Wikidata
