Of 14 counties in the Colony State, Middlesex County ranks fifth by size (846 square miles). Middlesex County is in Northeast Massachusetts. Recent listings of farms for sale in Massachusetts's Middlesex County totals 1,000 acres and a combined market value of approximately $4 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 individual needs. The most common type of land for sale by combined acreage in Middlesex County is house.