Of 21 counties in the Garden State, Middlesex County is 13th in terms of its size (322 square miles). Middlesex County is in North New Jersey. Recent listings of farms for sale in New Jersey's Middlesex County totals about 1,000 acres and a combined market value of nearly $2 million. The most common type of land for sale by combined acreage in Middlesex County is house. Browse all Middlesex County farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future business or lifestyle needs. The most common type of land for sale by combined acreage in Middlesex County is house.