Knox County is in Western Illinois. Of the 102 counties in the Prairie State, Knox County is 23rd in terms of its size (460,704 acres). Illinois's Knox County has approximately 1,000 acres of timberland for sale based on recent Land Network data. The combined market value of farmsand rural real estate for sale here was about $3 million. The average price of timberland for sale in Knox County was $681,375. Browse all Illinois forest and timberland for sale on the Land Network to find the right timberland acreage for your commercial or individual investment needs.