Of 14 counties in the Colony State, Middlesex County ranks fifth in terms of size (846 square miles). Middlesex County is in Northeast Massachusetts. Massachusetts's Middlesex County includes 1,000 acres of farms for sale based on recent Land Network data. The combined market value of farmsand rural real estate for sale here was roughly $4 million. 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 commercial or individual needs. The most common type of land for sale by combined acreage in Middlesex County is residential property.