Marengo County is a county in Alabama. It covers 983 square miles (629,069 acres), which represents less than one percent of the state total. Of Alabama's 67 counties, Marengo County ranks 49th in terms of the size of its population (20,028, according to 2015 Census estimates). Recent Lands of America data shows that the average price-per-acre value of land for sale in Marengo County is $3,007. On average, the price of land for sale was $915,042 (the most expensive listing being for $19.5 million) and the median land-parcel size was 80 acres. Land for sale in Marengo County totaled 12,781 acres and $38.4 million in overall land value, with the city of Thomaston featuring the most land for sale in the county. Farmland was the most common type of land for sale in Marengo County.