^Illinois 84 exits the village of Hanover toward the north, November 2023.
Illinois Route 84 is the westernmost north-south highway in northwestern Illinois, connecting Galena to the Quad Cities, occasionally within sight of the Mississippi River. The Great River Road follows Illinois 84 upstream of the Quad Cities.
Illinois Route 84's northern end is at the Wisconsin border north of Galena, where it becomes Wisconsin Highway 80:
On the west side of Galena, Illinois 84 joins US Route 20 eastward through that town:
Illinois 84 and US Route 20 run together through Galena:
East of Galena, Illinois 84 splits from US Route 20 to resume going southward....