Illinois 135 is a short route in Warren County (and along the border with Mercer County) that is shaped like an upside-down "L."

Intersections from northeast to southwest:

IL135 begins in the town of Alexis and runs west

US67 joins IL135 west

US67 leaves south

IL135 joins IL94 south

IL135 leaves IL94 south near Little York

IL135 ends at IL164 in western Warren County.

It passes through these towns: Alexis, and Little York.

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