Illinois State Route 124 is a short route running north out of the Springfield-Metro to the northern most area in Sangamon County. This route is entirely contained in this county.
In October, 2003 IL St Rt 124 was pulled back to a junction with IL St Rt 123, nine miles north of Sherman. The former section is now part of IL St Rt 123. That highway was extended back into Sangamon County, near Athens, to Williamsville. IL St Rt 124 passes through the following town. Sherman
IL St Rt 124 is not multi-plexed in Sangamon County. IL St Rt 124 intersects the following highways in Sangamon County. BUSN. Loop I-55, at Sherman.