Of 36 counties in the state, Gilliam County ranks 25th by size (1,222 square miles). Gilliam County is in Central Oregon. The total value of almost 6,000 acres of riverfront land and property recently listed for sale in Gilliam County, Oregon, was roughly $5 million. Browse all waterfront property for sale in Gilliam 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 Gilliam County is residential property.