Land for sale in Suffolk County recently totaled around $6 million and 200,000 acres. Based on the combined acreage of land and rural property for sale here, Suffolk County has the most land for sale of all counties in Massachusetts. Among cities in Suffolk County with farms, rural land, hunting land and other land for sale, Boston featured the most land for sale. Suffolk County is Massachusetts's 14th largest county (120 square miles). It's located in the Northeast Massachusetts region of the state.