Blue Knob is a summit located in Johnson County, Illinois. It appears on the Mermet USGS 7.5-minute topographic quadrangle. The nearest populated place is Grantsburg, approximately 1.6 miles to the N.
Johnson County · Illinois
Blue Knob is a summit located in Johnson County, Illinois. It appears on the Mermet USGS 7.5-minute topographic quadrangle. The nearest populated place is Grantsburg, approximately 1.6 miles to the N.