Of 39 counties in the Evergreen State, Walla Walla County is 26th in terms of its size (1,298 square miles). Walla Walla County is in Eastern Washington. The total value of nearly 1,000 acres of equestrian property recently listed for sale in Walla Walla County, Washington, was about $1 million. Browse all Walla Walla County horse farms for sale on the Land Network to find the equestrian property that's right for your future needs, whether you're a horse breeder, equestrian business or simply horse lover looking for stable facilities, grooming pens or grazing pasture for your own horses. The most common type of land for sale by combined acreage in Walla Walla County is house.