Illinois State Route 4 is the main north-south highway in Eastern St. Clair County. This is a two lane highway through the entire county. IL St Rt 4 passes through the following towns in St. Clair County. Lebanon
Mascoutah
Fayetteville
St. Libory
Marissa
IL St Rt 4 is multi-plexed in St. Clair County. U.S. Rt. 50, at Lebanon.
NB IL St Rt 4/WB IL St Rt 13 at the St. Clair/Washington County Line. SB IL St Rt 4/EB IL St Rt 13 near a CN crossing northwest of Tilden. SB IL St Rt 4/EB IL St Rt 13 near the Randolph/St. Clair/Washington County Line. SB IL St Rt 4/EB IL St Rt 13 east of Marissa. SB IL St Rt 4/EB IL St Rt 13 at Marissa. A junction marker on NB IL St Rt 4/WB IL St Rt 13. SB IL St Rt 4 north of IL St Rt 13. SB IL St Rt 4 on the northside of Marissa. SB IL St Rt 4 near Mud Creek. SB IL St Rt 4 near Mud Creek Road. SB IL St Rt 4 south of Lenzburg Road East. SB IL St Rt 4 north of Lenzburg Road East. NB IL St Rt 4 near Darmstadt. SB IL St Rt 4 south of St. Libory. SB IL St Rt 4 south of St. Libory. SB IL St Rt 4/EB IL St Rt 15 in St. Libory. A junction marker on SB IL St Rt 4/EB IL St Rt 15. SB IL St Rt 4/EB IL St Rt 15 north of St. Libory. SB IL St Rt 4/EB IL St Rt 15 near St. Libory. SB IL St Rt 4/EB IL St Rt 15 east of Fayetteville. SB IL St Rt 4/EB IL St Rt 15 near the Kaskaskia River in Fayetteville. A junction marker on EB IL St Rt 15. SB IL St Rt 4 north of IL St Rt 15. NB IL St Rt 4 north of Fayetteville. SB IL St Rt 4 north of Fayetteville. SB IL St Rt 4 south of Jefferson Road. SB IL St Rt 4 near Jefferson Road. SB IL St Rt 4 south of Mascoutah. SB IL St Rt 4 in Mascoutah. NB IL St Rt 4 at IL St Rt 177. SB IL St Rt 4 north of IL St Rt 177. NB IL St Rt 4 north of Mascoutah. NB IL St Rt 4 south of IL St Rt 161. SB IL St Rt 4 north of IL St Rt 161. NB IL St Rt 4 north of IL St Rt 161. NB IL St Rt 4 at Mid-America Airport. NB IL St Rt 4 south of I-64. A BGS on EB I-64. A BGS on EB I-64. NB IL St Rt 4 north of Mid-America Airport. A St. Clair County mile marker. SB IL St Rt 4 south of Lebanon. NB IL St Rt 4 south of Lebanon. NB IL St Rt 4 south of west of U.S. Rt. 50. EB U.S. Rt. 50/NB IL St Rt 4 in Lebanon. A junction marker on EB U.S. Rt. 50/NB IL St Rt 4 in Lebanon. WB U.S. Rt. 50/SB IL St Rt 4 at Dee St in Lebanon. A junction marker on WB U.S. Rt. 50. NB IL St Rt 4 north of east U.S. Rt. 50. NB IL St Rt 4 north of Lebanon.
