Of 36 counties in the state, Umatilla County ranks eighth in terms of size (3,231 square miles). Umatilla County is in Eastern Oregon. Recent Land Network data shows approximately 1,000 acres of equestrian property for sale in Oregon's Umatilla County, which is valued at a combined $850,000. Browse all Umatilla 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 Umatilla County is residential property.