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. Land for sale in Riverside County, California, recently totaled almost $3 billion and approximately 100,000 acres. Riverside County is among the top 10 counties in the U.S. with the most land currently for sale. Riverside County ranks third in the Golden State for the combined amount of land currently advertised for sale. Of all farms, ranches, hunting land and other land for sale in Riverside County, Temecula had the most land for sale. Based on its natural assets, tourism and recreation are important contributors to the Riverside County economy. Riverside County is one of the ten largest counties in California (7,303 square miles). It's located in the Deserts California region of California.