New Jersey's 665-square-mile Monmouth County covers eight percent of the state's total land area. Of New Jersey's 21 counties, Monmouth County ranks fifth in terms of the size of its population (628,715, according to 2015 Census estimates). Recent Lands of America data places the average value of land and acreage for sale in Monmouth County at $111,805 per acre. The average list price of property and land for sale was $931,333 (the most expensive listing being for $1.2 million) and the median acreage of land for sale in Monmouth County was seven acres. Land for sale in Monmouth County totaled 25 acres and $2.8 million in overall land value, with the city of Allentown featuring the most land for sale in the county. Farmland was the most common type of land for sale in Monmouth County.