A total of nearly 4,000 acres were listed for sale in New Jersey's Monmouth County recently, representing a total value of almost $819 million in Monmouth County farmsand rural real estate for sale. Monmouth County ranks first in the Garden State for the total acreage of land currently advertised for sale. Of all locations in Monmouth County with farms and rural real estate for sale, Manalapan featured the most land for sale. Monmouth County is one of the ten largest counties in New Jersey (665 square miles). It's located in the Central New Jersey region of New Jersey.