Putnam County is in Western Illinois. Of the 102 counties in the Inland Empire, Putnam County is 102nd in terms of its size (110,172 acres). The most common type of land for sale by combined acreage in Putnam County is undeveloped land. Browse all waterfront property for sale in Putnam 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!