Illinois 105 is a jagged route running from Monticello to Decatur. From Monticello, it runs south, west, south, and then west again. Markers on it read "North 105" and "South 105," though I think it runs more East-West. It runs completely within Macon and Piatt Counties.
Intersections from northeast to southwest:
IL105 begins at I-72 at Monticello
IL32 to/from the North near Cerro Gordo
IL32 to/from the South near Cerro Gordo
IL105 joins IL121 south at Decatur
One block past that, IL105 intersects US36 and IL121 follows US36 east
IL105 joins BR51 south on the south side of Decatur
Soon after, it breaks off
IL105 ends at IL48 in southwestern Decatur.
It passes through these towns: Monticello, Bement, Cerro Gordo, and Decatur.
