The value of all farmsand rural real estate for sale in Honolulu County recently was almost $55 million, representing a total of 7,397 acres of land for sale in Honolulu County. Honolulu County ranks fourth based on the total acres of land for sale among the five counties in the Pineapple State. Of all farms and rural real estate for sale in Honolulu County, Honolulu featured the most land for sale. Honolulu County is one of the ten biggest 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 the state.