Of 102 counties in the Prairie State, Winnebago County ranks 52nd in terms of size (519 square miles). Winnebago County is in Northern Illinois. There is approximately 1,000 acres of riverfront homes and property for sale in Winnebago County, Illinois, based on recent Land Network data. The combined market value of land for sale here is almost $1 million. Browse all waterfront property for sale in Winnebago 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 Winnebago County is residential property.