A total of around 4,000 acres were listed for sale in North Carolina's Johnston County recently, representing a total value of approximately $623 million in Johnston County land and rural real estate for sale. Johnston County ranks second in the Tar Heel State for the total number of acres of land currently advertised for sale. Smithfield featured the most land for sale. Johnston County is North Carolina's 14th biggest county (795 square miles). It's located in the Piedmont North Carolina region of North Carolina.