The total value of farms, rural land, hunting land and other land for sale in New Jersey's Middlesex County recently on Land.com was almost $107 million. This represents around 100,000 acres of farms, hunting land and other rural land and acreage for sale in Middlesex County. Middlesex County ranks 14th in the Garden State based on the total amount of acres of land for sale of the 21 counties in New Jersey. Among cities in Middlesex County with land and rural real estate for sale, Monroe had the most land for sale. Middlesex County is New Jersey's 13th biggest county (322 square miles). It's located in the North New Jersey region of New Jersey.