Illinois State Route 18 is a short east-west highway in Northern Marshall County. It is one of two bridges over the Illinois River in the county. IL St Rt 18 passes through the following town in Marshall County. Henry
WB IL St Rt 18/SB IL St Rt 26 at the Marshall/Putnam County Line. WB IL St Rt 18/SB IL St Rt 26 at south IL St Rt 26. WB IL St Rt 18 east of Henry. The IL St Rt 18 bridge over the Illinois River at Henry. The IL St Rt 18 bridge of the Illinois River at Henry. EB IL St Rt 18 at the Illinois River. EB IL St Rt 18 crossing the Illinois River. WB IL St Rt 18 at the Illinois River Bridge. WB IL St Rt 18 crossing the Illinois River. WB IL St Rt 18 crossing the Illinois River. WB IL St Rt 18 crossing the Illinois River. WB IL St Rt 18 crossing the Illinois River. WB IL St Rt 18 south of 3rd Street in Henry. WB IL St Rt 18 east of South Street in Henry. WB IL St Rt 18 at Railroad Street in Henry. EB IL St Rt 18 in Henry. A Marshall County mile marker. The western end marker.
