Rock Island County is in Western Illinois. Of the 102 counties in the Prairie State, Rock Island County is 62nd in terms of its size (451 square miles). Recent listings of farms for sale in Rock Island County, Illinois, totals 1,000 acres and a combined market value of almost $8 million. The most common type of land for sale by combined acreage in Rock Island County is undeveloped land. The average price of farms for sale in Rock Island County was $2 million. Farms for sale in Rock Island 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 commercial or individual needs.