Illinois State Route 161 runs east-west in Southwestern Marion County. This runs from the Clinton/Marion County Line, at Centralia, to a junction with Illinois State Route 37, near Carter. IL St Rt 161 passes through the following town in Marion County. Centralia
IL St Rt 161 is not multi-plexed in Marion County. IL St Rt 161 intersects the following highways in Marion County. U.S. Rt. 51, at Centralia.
WB IL St Rt 161 in Centralia. A BGS on NB I-57. WB IL St Rt 161 at I-57. WB IL St Rt 161 west of IL St Rt 37. A junction marker on NB IL St Rt 37. The eastern end marker.
