Of 102 counties in the Prairie State, Randolph County ranks 38th in terms of size (596 square miles). Randolph County is in Southwest Illinois. Randolph County, Illinois, has almost 1,000 acres of lakefront homes and property for sale based on recent Land Network data. The combined market value of land for sale here was nearly $500,000. Browse all waterfront property for sale in Randolph 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 Randolph County is house.