Of 67 counties in the Keystone State, Sullivan County ranks 50th by size (452 square miles). Sullivan County is in Northeast Mountains Pennsylvania. Sullivan County, Pennsylvania, includes around 1,000 acres of horse farms for sale based on recent Land Network data. The combined market value of farmsand rural real estate for sale here was almost $800,000. Browse all Sullivan 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 Sullivan County is residential property.