Illinois 185 is a northwest-southeast running route from near Hillsboro, through Vandalia, to the I-57 corridor just north of Mt. Vernon and I-64.

Intersections from NW to SE:

IL185 begins in the west at IL127 at Taylor Springs

IL185 joins US40 at Vandalia

US51 joins from the north at Vandalia

US51 breaks off of US40/IL185 on the east side of Vandalia

IL185 breaks off of US40

I-57

IL185 ends in the east at IL37 in Farina.

It passes through these towns: Taylor Springs, Coffeen, Vandalia, St. Peter, Farina.

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