The value of ranches, farms, hunting land and other rural land and acreage for sale in Gilliam County, Oregon, recently on Land.com was nearly $18 million. This represents 9,000 acres of farms, ranches, and rural real estate for sale in Gilliam County. Gilliam County ranks 34th out of 36 counties in Oregon for the total acreage 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 the 25th largest county (1,222 square miles) in Oregon. It's located in the Central Oregon region of Oregon.