There was a combined almost $115 million of land for sale in Coos County recently on Land.com. The total size of all Coos County land and rural real estate for sale was nearly 4,000 acres. Coos County ranks 10th in Oregon for the total number of acres of land currently advertised for sale. Among cities in Coos County with farms and ranches for sale, Charleston featured the most land for sale. Coos County is Oregon's 20th largest county (1,806 square miles). It's located in the Southern Oregon region of the state.