| State: | IL |
| Type: | IL |
| Maint: | IDOT |
| Route: | 115 |
| Map Custom: | yes |
| Map Notes: | IL 115 highlighted in red |
| Length Mi: | 63.37 |
| Length Round: | 2 |
| Length Ref: | [1] |
| Terminus A: | in Elliott |
| Direction A: | South |
| Junction: | in Piper City |
| Terminus B: | in Kankakee |
| Direction B: | North |
| Counties: | Ford, Kankakee |
| Established: | 1924[2] |
| Previous Route: | 114 |
| Previous Type: | IL |
| Next Type: | IL |
| Next Route: | 116 |
Illinois Route 115 is a minor north - south state route in northeastern Illinois. It runs from Illinois Route 9 near Perdueville to the concurrent U.S. Routes 45/52 in Kankakee. This is a distance of 63.37miles.
Illinois 115 is a north - south highway from Perdueville to Buckingham; at Buckingham, it turns east but is still marked north - south. South of Kankakee, Illinois 115 turns north again on its way into Kankakee.
Illinois 115 is an undivided two-lane surface state route for its entire length.
SBI Route 115 ran from near Kankakee to Perdueville along what is Illinois 115 now. In 1954, when U.S. 45 was moved onto a new road, Illinois 115 was extended north into Kankakee onto old U.S. 45.[2]