Of 36 counties in the Beaver State, Union County ranks 17th in terms of size (2,038 square miles). Union County is in Eastern Oregon. Recent listings of horse farms for sale in Union County, Oregon, totals around 1,000 acres and a combined market value of approximately $1 million. The most common type of land for sale by combined acreage in Union County is residential property. Browse all Union 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 Union County is residential property.