Illinois Route 109 is a very short north-south highway in Jersey County. This drops south from Jerseyville, connecting that community to Illinois 3, just north of the Metro-East region.
Illinois 109 has its northern endpoint situated along US Route 67, just south of Illinois 16 in Jerseyville:
Illinois 109 has its northern endpoint situated along US Route 67, just south of Illinois 16 in Jerseyville:
The southern end of Illinois 109, located near Dow, is along the part of Illinois 3 that hooks west from Alton.
