Illinois 177 is and east-west route running from US51 into the outskirts of the St. Louis area.

Intersections from east to west:

US51 near Irvington

IL127 at New Minden

I-64 near Okawville

IL177 joins IL160 at Okawville

IL160 leaves near New Memphis

IL4 at Mascoutah

IL158 joins from the north and follows IL177 until IL177 ends

IL177 ends at IL159 by Belleville.

It passes through these towns: Irvington, Hoyleton, New Minden, Okawville, Mascoutah, Belleville.

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