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. SB IL St Rt 159 near Bethel Mine Road. NB IL Rt 159 north of I-64/U.S. Rt. 50. 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) A BGS on EB I-64/U.S. Rt. 50. NB IL St Rt 159 south of I-64/U.S. Rt. 50. SB IL St Rt 159 near St. Clair Square in Fairview Heights. NB IL St Rt 159 north of Lincoln Highway. SB IL St Rt 159 south of Lincoln Highway. SB IL St Rt 159 in Swansea. NB IL St Rt 159 in Swansea. SB IL St Rt 159 north of IL St Rt 161. 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 marker on EB IL St Rt 13/158. A junction marker on WB IL St Rt 13/158. NB IL St Rt 159 north of IL St Rt 15. 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. A BGS on EB IL St Rt 15. WB IL St Rt 156/SB IL St Rt 159 north of Hecker.
