Walla Walla County is in Eastern Washington. Of the 39 counties in the Evergreen State, 1,298-square-mile Walla Walla County ranks 26th by size. Recent listings of residential land for sale in Walla Walla County, Washington, totals roughly 1,000 acres and a combined market value of $25 million. The most common type of land for sale by combined acreage in Walla Walla County is house. The average price of residential land for sale in Walla Walla County was $675,362. Browse all residential land and rural property for sale in Washington to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.