Illinois State Route 40 is a north-south highway in Southeastern and South-Central Carroll County. It runs from the Whiteside/Carroll County Line, near Coleta, to Illinois State Route 78, at Mt. Carroll. IL St Rt 40 passes through the following towns in Carroll County. Milledgeville
Chadwick Mt. Carroll IL St Rt 40 is not multi-plexed in Carroll County. IL St Rt 40 intersects the following highway in Carroll County. Illinois State Route 78, at Mt. Carroll.
SB IL St Rt 40 south of 4th in Milledgeville. SB IL St Rt 40 north of Milledgeville. SB IL St Rt 40 south of Cook Road. SB IL St Rt 40 west of Benson Road. SB IL St Rt 40 near Rock Creek. SB IL St Rt 40 south of Chadwick. SB IL St Rt 40 near Snow Street in Chadwick. A guide marker on WB U.S. Rt. 52/IL St Rt 64. A junction marker on SB IL St Rt 78. SB IL St Rt 40 south of IL St Rt 78. The northern end of IL St Rt 40.
