Illinois State Route 3 is the main route in Monroe County. This highway runs north-south from St. Clair County to Randolph County. From Interstate 255, at Columbia, to Waterloo, IL St Rt 3 is four lanes. IL St Rt 3 passes through the following towns in Monroe County. Columbia
Waterloo
IL St Rt 3 is multi-plexed in Monroe County. Interstate 255, from the St. Clair/Monroe County Line to Columbia. U.S. Rt. 50, from the St. Clair/Monroe County Line to Columbia. IL St Rt 3 intersects the following highways in Monroe County. Interstate 255, at Columbia. U.S. Rt. 50, at Columbia.
SB I-255/IL St Rt 3; WB U.S. Rt. 50 at the Monroe/St. Clair County Line. SB I-255/IL St Rt 3; WB U.S. Rt. 50 at the Monroe/St. Clair County Line. SB I-255/IL St Rt 3; WB U.S. Rt. 50 south of the Monroe/St. Clair County Line. A BGS on NB I-255/EB U.S. Rt. 50. A BGS on NB I-255/EB U.S. Rt. 50. A BGS on NB I-255/EB U.S. Rt. 50. A BGS on SB I-255/IL St Rt 3; WB U.S. Rt. 50. A BGS on SB I-255/IL St Rt 3; WB U.S. Rt. 50. A set of BGS's on NB IL St Rt 3. A BGS in Columbia. Looking north along IL St Rt 3 in Columbia. A sign for the last exit before I-255/U.S. Rt. 50, on NB IL St Rt 3 in Columbia. SB IL St Rt 3 south of Main in Columbia. NB IL St Rt 3 in Columbia. SB IL St Rt 3 at IL St Rt 158. NB IL St Rt 3 at IL St Rt 158. A BGS on WB IL St Rt 158. A BGS on WB IL St Rt 158. A BGS on WB IL St Rt 158. A BGS on WB IL St Rt 158. A Monroe County mile marker. NB IL St Rt 3 near New Hanover. A guide marker on NB IL St Rt 3. SB IL St Rt 3 at Waterloo. SB IL St Rt 3 north of IL St Rt 156. NB IL St Rt 3 south of Waterloo. A milage sign on SB IL St Rt 3.
