Illinois State Route 37 runs in the extreme northwestern corner of Clay County. It runs between Interstate 57 and the Canadian National railroad. This highway does not pass through any towns or intersect any major highways while in Clay County. IL St Rt 37 does not pass through any towns in Clay County. IL St Rt 37 is not multi-plexed in Clay County. IL St Rt 37 intersects the following highways in Clay County.
NB IL St Rt 37 at the Marion/Clay County Line. NB IL St Rt 37 south of Edgewood.
