Williamson County is in Southern Illinois. Of the 102 counties in the state, Williamson County ranks 65th in terms of size (444 square miles). Recent listings of farms for sale in Williamson County, Illinois, totals 1,000 acres and a combined market value of almost $5 million. The most common type of land for sale by combined acreage in Williamson County is residential property. The average price of farms for sale in Williamson County was $1 million. Farms for sale in Williamson County sustain livestock including horses, cattle, goats, sheep and pig. Browse all Illinois farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future business or lifestyle needs.