^Looking west on Illinois 161, just outside of Shattuc, February 2023.

Illinois Route 161 is an east-west route that starts in the Metro-East and heads east to Centralia and Interstate 57.

​Illinois 161 has an unmarked western endpoint along St. Clair Avenue just east of Illinois 157.  From this point, Illinois 161 embarks on a southeasterly journey toward the Swansea-Belleville area...

In Swansea, Illinois 161 meets Illinois 159 at a signalized intersection...

Illinois 158, coming from the north, joins Illinois 161 for a short jog east...

After this short concurrency, Illinois 158 continues south...

In Mascoutah, Illinois 161 crosses Illinois 4...

Then, as Illinois 161 is leaving Mascoutah, Interstate 64 crosses over with a diamond interchange for access...

At New Baden, Illinois 161 crosses Illinois 160...

South of Carlyle, Illinois 161 crosses Illinois 127...

In the heart of Centralia, Illinois 161 meets US Route 51, where each route uses a pair of one-way streets...

When Illinois 161 is almost at its end, Interstate 57 meets the route with a diamond interchange...

Illinois 161 meets Illinois 37, coming to an end a mile beyond Interstate 57...

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