NULL Of 254 counties in the Lone Star State, Rockwall County ranks 254th by size (148 square miles). Rockwall County is in Dallas Prairie Texas. Recent Land Network data records 1,000 acres of equestrian property for sale in Texas's Rockwall County, which is valued at a combined $11 million. Browse all Rockwall 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 Rockwall County is residential property.