Illinois State Route 31 is one of the two short north-south highways in Northeastern Kendall County. This runs along the westenr banks of the Fox River. IL St rt 31 passes through the following towns in Kendall County. Montgomery
IL St Rt 31 is not multi-plexed in Kendall County. IL St Rt 31 intersects the following highway in Kendall County. U.S. Rt. 34, at Oswego.