This is the northern most county for IL St Rt 1. Route 1 runs from the southside of Chicago through the southern suburbs to Will County. IL St Rt 1 passes through the following towns. Chicago Calumet Park
East Hazel Crest Homewood
South Chicago Heights Steger
IL St Rt 1 is not multi-plexed in Cook County. IL St Rt 1 intersects the following highways in Cook County. U.S. Rt. 30 at Chicago Heights.