A total of approximately 1,000 acres were listed for sale in Nantucket County recently, representing a combined around $115 million in Nantucket County land for sale. Nantucket County ranks 13th out of 14 counties in the Bay State for the total number of acres of land currently advertised for sale. Nantucket had the most land for sale. Nantucket County is the 13th largest county (303 square miles) in Massachusetts. It's located in the Southeast Massachusetts region of Massachusetts.