Illinois 73 is a north-south route in northwestern Illinois. It runs completely within Stephenson and Carroll Counties.

Intersections from north to south:

IL73 begins at the Wisconsin border, at Martintown, WI. Wisconsin Highway 176 turns into IL73 upon crossing into Illinois.

IL73 crosses US20 near Lena

IL73 meets IL72 near Shannon at that route's western end

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IL73 ends at US52/IL64 at Lanark.

It passes through these towns: Winslow, Lena, Pearl City, and Lanark.

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