Illinois State Route 159 runs north-south through the central portion of St. Clair County. In downtown Belleville, this highway is diverted around a water fountain at the St. Clair County Courthouse. IL St Rt 159 passes through the following towns in St. Clair County. Caseyville Fairview Heights
Swansea
Belleville
Smithton IL St Rt 159 is multi-plexed in St. Clair County. Illinois State Route 156, near Hecker.
IL St Rt 159 intersects the following highways in St. Clair County. Interstate 64, at Fairview Heights.
A St. Clair County mile marker. NB IL St Rt 159 near Caseyville. NB guide marker, north of I-64/U.S. Rt. 50. A BGS on EB I-64/U.S. Rt. 50. A BGS on EB I-64/U.S. Rt. 50. (Sept., 2007) SB IL St Rt 159 near St. Clair Square in Fairview Heights. SB IL St Rt 159 in Swansea. The fountain at Main Street in Downtown Belleville at night. NB IL St Rt 159 at the fountain in Downtown Belleville during the day. NB IL St Rt 159 north of IL St Rt 13/158 in Belleville. A junction makrer on EB IL St Rt 13/158. A BGS on WB IL St Rt 15. Overhead BGS's on WB IL St Rt 15. A BGS on EB IL St Rt 15. WB IL St Rt 156/SB IL St Rt 159 north of Hecker.
