The total value of land and rural real estate for sale in Oregon's Gilliam County recently on Land.com was almost $18 million. This represents nearly 9,000 acres of farms, ranches, hunting land and other land for sale in Gilliam County. Gilliam County ranks 34th in the Beaver State for the total number of acres of land currently advertised for sale. Of all ranches, farms, hunting land and other rural land and acreage for sale in Gilliam County, Arlington featured the most land for sale. Gilliam County is Oregon's 25th largest county (1,222 square miles). It's located in the Central Oregon region of the state.