The value of farms and ranches for sale in Gilliam County recently on Land.com was around $19 million. This represents almost 9,000 acres of ranches, farms, hunting land and other rural land and acreage for sale in Gilliam County. Gilliam County ranks 34th out of 36 counties in Oregon for the total number of acres of land currently advertised for sale. Among cities in Gilliam County with ranches, farms, hunting land and other rural land and acreage for sale, 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 Oregon.