The value of all farms and rural land for sale in Honolulu County recently was nearly $132 million, representing a combined 58,028 acres of land for sale in Honolulu County. Based on the combined acreage of land and rural property for sale here, Honolulu County has the most land for sale of all counties in Hawaii. Among cities in Honolulu County with farms, hunting land and other rural land and acreage for sale, Honolulu had the most land for sale. Honolulu County is one of the ten largest counties in Hawaii (2,166 square miles, or some 100 percent of the state's total land area). It's located in the Oahu Hawaii region of Hawaii.