Douglas County is in Central Illinois. Of the 102 counties in the Inland Empire, 267,023-acre Douglas County ranks 72nd by size. The most common type of land for sale by combined acreage in Douglas County is house. Browse all waterfront property for sale in Douglas 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!