Williamson County is in Southern Illinois. Of the 102 counties in the state, 444-square-mile Williamson County ranks 65th by size. Recent listings of farms for sale in Illinois's Williamson County totals around 1,000 acres and a combined market value of roughly $5 million. The most common type of land for sale by combined acreage in Williamson County is undeveloped land. 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 commercial or individual needs.