Illinois 138 is a short east-west route running completely within the southern part of Macoupin County.

Intersections from west to east:

IL138 begins at IL159 in south-central Macoupin County

IL138 joins IL43 south for a very short distance near Mount Clare

IL4 departs from IL138 at Benld

IL138 intersects with I-55

IL138 ends in the east in the town of Mount Olive.

It passes through these towns: Wilsonville, Benld, and Mt. Olive.

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