Land for sale in Pennsylvania's Franklin County recently totaled nearly $76 million and nearly 2,000 acres. Franklin County ranks 26th in the Independence State for the combined amount of land currently advertised for sale. Among cities in Franklin County with farms and rural real estate for sale, Greencastle had the most land for sale. Franklin County is Pennsylvania's 27th biggest county (772 square miles). It's located in the Dutch Country Roads Pennsylvania region of the state.