Illinois Route 90 (IL 90) is an east–west state highway in northern Peoria County in central Illinois.

[1] 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.

[3][4] SBI[clarification needed] Route 90 ran from Laura in Peoria County to Sparland in Marshall County along current Illinois 90, IL 17 and IL 40.

[2] The entire route is in Peoria County.