Of 102 counties in the Land of Lincoln, Mercer County is 44th in terms of its size (568 square miles). Mercer County is in Western Illinois. The total value of around 1,000 acres of equestrian property recently listed for sale in Illinois's Mercer County was nearly $500,000. 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 farms.