Illinois State Route 125 starts in Sangamon County where IL St Rt 97 turns north for Menard County. It keeps heading in the northwesterly direction toward Cass County. IL St Rt 125 does not pass through any towns in Sangamon County. IL St Rt 125 is not multi-plexed in Sangamon County. IL St Rt 125 intersects the following highways in Sangamon County. Illinois State Route 97, near Farmingdale.
A BGS on SB IL St Rt 4. A BGS on NB IL St Rt 4. A junction marker on SB IL St Rt 97. A junction marker on NB IL St Rt 97. The first WB guild marker. The eastern end marker. EB IL St Rt 125 at IL St Rt 97. This is the eastern end of IL St Rt 125. (2003) The eastern end of IL St Rt 125. (2005) The eastern end of IL St Rt 125. (Sept., 2009) The eastern end marker. (Sept., 2009) EB IL St Rt 125 near Farmingdale Road. A Sangamon County mile marker. EB IL St Rt 125 in Pleasant Plains. A street sign in Pleasant Plains. A junction marker on WB IL St Rt 123. WB IL St Rt 125 west of IL St Rt 123. WB IL St Rt 125 near Glick Road.
