A combined 3 million acres were listed for sale in Honolulu County recently; the combined value of all Honolulu County farms, rural land, hunting land and other land for sale was approximately $698 million. 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. Of all land for sale in Honolulu County, Honolulu featured 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.