Land for sale in Suffolk County recently totaled nearly $12 million and nearly 300,000 acres. Based on the combined acreage of land and rural property for sale here, Suffolk County has the most land for sale of the 14 counties in Massachusetts. Of all farms and rural real estate for sale in Suffolk County, Boston had the most land for sale. Suffolk County is the 14th biggest county (120 square miles) in Massachusetts. It's located in the Northeast Massachusetts region of the state.