In Fulton County, Illinois 41 heads north and passes through Avon before entering Knox County. The highway enters St. Augustine in southern Knox County, intersecting Illinois 116 along the village's northern edge.
Highway 41 traverses Fulton County, Illinois, heading north and passing through Avon before entering Knox County. It then enters St. Augustine in southern Knox County, intersecting with Illinois 116 near the village's northern boundary.