There was a combined approximately $28 million of farms, ranches, hunting land and other land for sale in Idaho's Washington County recently on Land.com. The total size of all Washington County ranches, farms, hunting land and other rural land and acreage for sale was nearly 7,000 acres. Washington County ranks 35th out of 44 counties in the state for the total number of acres of land currently advertised for sale. Of all locations in Washington County with farms, ranches, hunting land and other land for sale, Weiser had the most land for sale. Washington County is the 20th biggest county (1,473 square miles) in Idaho. It's located in the Southwestern Idaho region of the state.