Iroquois County Highway 23 runs north-south in Northwestern Iroquois County. It goes from the Iroquois/Kankakee County Line, near Herscher, to Ashkum. ICH 23 does not pass through any towns in Iroquois County. ICH 23 intersects the following highways in Iroquois County. Kankakee County Highway 28, near Herscher. Kankakee County Highway 37, near Herscher. Iroquois County Highway 4, near Clifton.
SB ICH 23 south of the Iroquois/Kankakee County Line.
