Illinois State Route 37 runs north-south in South-Central Effingham County. This is the northern most county it passes through. IL St Rt 37 passes through the following towns in Effingham County. Watson
Mason
Edgewood
IL St Rt 37 is not multi-plexed in Effingham County. IL St Rt 37 intersects the following highway in Effingham County. U.S. Rt. 45, near Watson.
NB IL St Rt 37 at the Clay/Effingham County Line. NB IL St Rt 37 near Edgewood. NB IL St Rt 37 near Mason. NB IL St Rt 37 south of Watson. NB IL St Rt 37 at I-57. SB IL St Rt 37 south of I-57. A guide marker on NB IL St Rt 37. A guide marker on NB IL St Rt 37. NB IL St Rt 37 at a Canadian National railroad underpass south of Watson. A junction marker on SB U.S. Rt. 45. The northern end of IL St Rt 37. The northern end marker.
