Illinois 123 is a jagged route running from IL125 near Pleasant Plains north, then east, then north, then east, then south, then east to end at I-55 near Williamsville.

Intersections from west to east:

IL123 begins at IL125

Next, it joins IL97 north through Petersburg

It leaves IL97 east

Then IL123 joins IL29 south through Athens

After that, it breaks off and heads west

IL123 intersects IL124 at its northern end

(photo is from the east)

Finally, it terminates at I-55.

It passes through these towns: Tallula, Petersburg, Athens, Williamsville.

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