There are 3 lookouts registered in Illinois. The most recently registered lookout is Trigg Tower (US 1236, IL 3), added on August 28, 2017.
| Lookout Name | NHLR Registry Number | Available for Rental | Visit Reports |
| Big River Lookout | US 80, IL 1 | ||
| Trigg Tower | US 1236, IL 3 | ||
| Union (Trail of Tears) Lookout | US 81, IL 2 | 1 report |