Williamson County is in Southern Illinois. Of the 102 counties in the state, Williamson County is 65th in terms of its size (444 square miles). There is almost 1,000 acres of farms for sale in Illinois's Williamson County based on recent Land Network data. The combined market value of farms and rural land for sale here is around $5 million. The average price of farms for sale in Williamson County was $1 million. Farms for sale in Williamson County support 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.