Of 67 counties in the Keystone State, Washington County ranks 20th by size (860 square miles). Washington County is in Pittsburgh & Countryside Pennsylvania. Pennsylvania's Washington County has about 1,000 acres of horse properties for sale based on recent Land Network data. The combined market value of farms, rural land, hunting land and other land for sale here was about $500,000. Browse all Washington 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 Washington County is residential property.