Illinois State Route 40 is a north-south route in western Marshall County. IL St Rt 40 passes through the following towns in Marshall County. Lawn Ridge Camp Grove IL St Rt 40 in multi-plexed in Marshall County. Illinois State Route 17, near Camp Grove.
IL St Rt 40 intersects the following highway in Marshall County. Illinois State Route 17, near Camp Grove.
Marshall County mile marker. EB IL St Rt 17/SB IL St Rt 40 near La Prairie Center.
