There are 5 former lookout sites registered in Delaware. The most recently registered former lookout site is Viola Tower Site (US 74, DE 5), added on September 11, 2008.
| Lookout Name | NHLR Registry Number | Available for Rental | Visit Reports |
| Dagsboro Tower Site | US 70, DE 1 | ||
| Ellendale Tower Site | US 71, DE 2 | ||
| Laurel Tower Site | US 72, DE 3 | ||
| Smyrna Tower Site | US 73, DE 4 | ||
| Viola Tower Site | US 74, DE 5 |