Illinois State Route 159 runs north-south through Eastern Monroe County. This is a main link between Red Bud and Belleville. IL St Rt 159 passes through the following town in Monroe County. Hecker
IL St Rt 159 intersects the following highways in Monroe County. Illinois State Route 156, at Hecker.
NB IL St Rt 159 at the Monroe/St. Clair County Line. A set of junction markers on WB IL St Rt 156/SB IL St Rt 159. SB IL St Rt 159 south of Hecker. NB IL St Rt 159 south of Hecker. NB IL St Rt 159 north of the Monroe/Randolph County Line.
