Illinois State Route 172 runs very briefly in Northwestern Bureau County. It runs from Illinois State Route 92, north to the Bureau/Whiteside County Line. This is west of the Hennepin Canal Feeder. IL St Rt 172 does not pass through any towns in Bureau County. IL St Rt 172 is not multi-plexed in Bureau County. IL St Rt 172 intersects the following highway in Bureau County. Illinois State Route 92, near Yorktown.
A junction marker on WB IL St Rt 92. The first marker on NB IL St Rt 172. The southern end of IL St Rt 172. The southern end marker. NB IL St Rt 172 north of IL St Rt 92.
