Day County is located in South Dakota. The county covers 1,091 square miles (698,426 acres), equaling less than one percent of the state's total area. Of South Dakota's 66 counties, Day County ranks 32nd in terms of the size of its population (5,539, according to 2015 Census estimates). Its economy is defined as agricultural, with 693 farms recorded in the county during the 2012 U.S. Census. Recent Lands of America data places the average value of land for sale in Day County at $3,031 per acre. The average list price of property and land for sale was $970,000 (the most expensive listing being for $1.4 million) and the median size of land and property for sale in Day County was 320 acres. Land for sale in Day County totaled 640 acres and $1.9 million in overall land value, with the city of Grenville featuring the most land for sale in the county. Given its rural location and ecomony, farms and other agricultural acreage are the most common types of land for sale in Day County.