Of 36 counties in the Beaver State, Gilliam County ranks 25th in terms of size (1,222 square miles). Gilliam County is in Central Oregon. Gilliam County, Oregon, has 6,000 acres of riverfront homes and property for sale based on recent Land Network data. The combined market value of land for sale here was about $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.