Illinois State Route 23 runs east-west across the center of De Kalb County. This is one of the main highways in De Kalb and the county. IL St Rt 23 passes through the following town in De Kalb County. Waterman
NB IL St Rt 23/EB IL St Rt 72 east of south IL St Rt 23. NB IL St Rt 23 at Hill Street in Genoa. NB IL St Rt 23 near Base Line Road. NB IL St Rt 23 near Whipple Road. NB IL St Rt 23 north of Sycamore. NB IL St Rt 23 near Mt. Hunger Road. NB IL St Rt 23 near Page Street. NB IL St Rt 23/EB IL St Rt 64 in Downtown Sycamore. NB IL St Rt 23/EB IL St Rt 64 in Sycamore. A junction marker on SB IL St Rt 23/WB IL St Rt 64. NB IL St Rt 23 south of west IL St Rt 64. NB IL St Rt 23 on the southside of Sycamore. NB IL St Rt 23 on the northside of De Kalb. NB IL St Rt 23 at Locust in De Kalb. NB IL St Rt 23 at IL St Rt 38. This intersection has a rail crossing in the middle of it. A junction marker on EB IL St Rt 38. NB IL St Rt 23 south of Downtown De Kalb. NB IL St Rt 23 on the southside of De Kalb. A BGS on EB I-88. A BGS on EB I-88. A BGS on WB I-88/IL St Rt 110. NB IL St Rt 23 near I-88. SB IL St Rt 23 south of De Kalb. NB IL St Rt 23 near Elva. NB IL St Rt 23 near Mc Girr. NB IL St Rt 23 near Waterman. NB IL St Rt 23 at U.S. Rt. 30. SB IL St Rt 23 south of Waterman. NB IL St Rt 23 near Shabonna Grove. A De Kalb County mile marker. NB IL St Rt 23 near Rollo. NB IL St Rt 23 at the La Salle/De Kalb County Line. NB IL St Rt 23 at the La Salle/De Kalb County Line.
