Illinois State Route 109 is a north-south highway in Central Jersey County. It links the Greater-Alton Area to Jerseyville, via IL St Rt 3. IL St Rt 109 passes through the following towns in Jersey County. East Newbern Jerseyville
IL St Rt 109 is not multi-plexed in Jersey County. IL St Rt 109 intersects the following highways in Jersey County. U.S. Rt. 67, at Jerseyville.