Iowa's 592-square-mile Polk County covers less than one percent of the state's total land area. Of Iowa's 99 counties, Polk County is the biggest county in the state (467,711 people live here, according to 2015 Census estimates). Recent Lands of America data places the average value of land for sale in Polk County at $3,887 per acre. On average, the price of land for sale was $224,501 (the most expensive listing being for $449,000) and the median size of land and property for sale in Polk County was 58 acres. Land for sale in Polk County totaled 116 acres and $449,002 in overall land value, with the city of Ankeny featuring the most land for sale in the county. Farmland was the most common type of land for sale in Polk County.