Polk County is located in Missouri. The county covers 643 square miles (411,206 acres), which represents less than one percent of the state total. Of Missouri's 115 counties, Polk County ranks 36th in terms of the size of its population (31,229, according to 2015 Census estimates). The county is also considered popular among retirees. Recent Lands of America data places the average value of ranches, land, farms and other recreational acreage for sale in Polk County at $4,515 per acre. The average listing price was $154,446 (the most expensive listing being for $640,000) and the median size of land and property for sale in Polk County was 10 acres. Land for sale in Polk County totaled 1,129 acres and $5.1 million in overall land value, with the city of Bolivar featuring the most land for sale in the county. Farmland was the most common type of land for sale in Polk County.