Located in Deserts California, 7,303-square-mile Riverside County is one of the ten biggest counties in the Golden State. Riverside County is a large county in Southern California that stretches from the L.A. sprawl across Palm Springs into the desert around Joshua Tree National Park. The county was recently?ranked third in population growth among large counties nationwide, according to a U.S. Census Bureau report. Browse all Riverside County farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future business or individual needs. The most common type of land for sale by combined acreage in Riverside County is undeveloped land.