| State: | IL |
| Type: | IL |
| Route: | 90 |
| Map Custom: | yes |
| Map Notes: | IL 90 highlighted in red |
| Length Mi: | 15.80 |
| Length Ref: | [1] |
| Direction B: | East |
| Direction A: | West |
| Terminus A: | near Laura |
| Terminus B: | near Edelstein |
| Counties: | Peoria |
| Established: | 1924[2] |
| Previous Type: | I |
| Previous Route: | 90 |
| Next Route: | 91 |
| Next Type: | IL |
Illinois Route 90 (IL 90) is an east - west state highway in northern Peoria County in central Illinois. It runs from IL 78 north of Laura to IL 40 south of Edelstein. This is a distance of 15.8miles.
IL 90 is an undivided two-lane surface road for its entire length. It passes north of the community of Monica and through the village of Princeville. While in Princeville, IL 90 runs concurrent with IL 91 from Princeville east for 4miles.[3]
SBI Route 90 ran from Laura in Peoria County to Sparland in Marshall County along current Illinois 90, IL 17 and IL 40. This was changed to its current alignment in 1938.[2]