Of 102 counties in the Inland Empire, Rock Island County is 62nd in terms of its size (451 square miles). Rock Island County is in Western Illinois. There is around 1,000 acres of riverfront homes and property for sale in Illinois's Rock Island County based on recent Land Network data. The combined market value of farms, hunting land and other rural land and acreage for sale here is nearly $7 million. Browse all waterfront property for sale in Rock Island County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! The most common type of land for sale by combined acreage in Rock Island County is undeveloped land.