There was a combined nearly $193 million of farms, hunting land and other rural land and acreage for sale in Newport County, Rhode Island, recently on Land.com. The total acreage of all Newport County land and rural real estate for sale was almost 100,000 acres. Based on the combined acreage of land and rural property for sale here, Newport County has the most land for sale of the five counties in Rhode Island. Tiverton featured the most land for sale. Newport County is one of the ten biggest counties in Rhode Island (313 square miles). It's located in the South Rhode Island region of Rhode Island.