Of 67 counties in the Keystone State, Mercer County ranks 33rd in terms of size (682 square miles). Mercer County is in Great Lakes & Wilds Pennsylvania. There is nearly 1,000 acres of equestrian property for sale in Mercer County, Pennsylvania, based on recent Land Network data. The combined market value of farms and rural land for sale here is about $4 million. Browse all Mercer 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 Mercer County is residential property.