Of 44 counties in the Gem State, Ada County ranks 31st in terms of size (1,060 square miles). Ada County is in Southwestern Idaho. There is almost 1,000 acres of equestrian property for sale in Idaho's Ada County based on recent Land Network data. The combined market value of land for sale here is about $2 million. Browse all Ada 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 Ada County is house.