Illinois State Route 56 cuts east-west across Du Page County. This is one of the heavly traveled east-west surface highways in the county. IL St Rt 56 passes through the following towns in Du Page County. Aurora
Wheaton Downers Grove Lombard
Oak Brook Terrace
IL St Rt 56 is not multi-plexed in Du Page County. IL St Rt 56 intersects the following highways in Du Page County. Illinois State Route 59, at Warrenville.