Illinois State Route 156 runs east-west across Northern Monroe County. This connects many small towns to each other. IL St Rt 156 passes through the following towns in Monroe County. Hecker
A set of junction markers on WB IL St Rt 156/SB IL St Rt 159. WB IL St Rt 156 east of Waterloo. WB IL St Rt 156 at Waterloo. A junction sign on SB IL St Rt 3. WB IL St Rt 156 west of Waterloo. WB IL St Rt 156 west of Foster Pond. WB IL St Rt 156 east of Valmeyer. The western end of IL St Rt 156. The western end marker. A Monroe County mile marker.
