Williamson County is in Southern Illinois. Of the 102 counties in the Inland Empire, 284,385-acre Williamson County ranks 65th by size. A recent survey of Land Network data totals about 1,000 acres of farms for sale in Illinois's Williamson County, which is valued at a combined $5 million. The average price of farms for sale in Williamson County was $1 million. Farms for sale in Williamson County support livestock including cattle, horses, 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 commercial or lifestyle needs.