Of 14 counties in the state, Middlesex County is fifth in terms of its size (846 square miles). Middlesex County is in Northeast Massachusetts. A recent survey of Land Network data records almost 1,000 acres of farms for sale in Massachusetts's Middlesex County, which is valued at a combined $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.