Land for sale in Washington's Franklin County recently totaled approximately $173 million and almost 3,000 acres. Franklin County ranks seventh in the Evergreen State for the combined amount of land currently advertised for sale. Of all locations in Franklin County with farms, ranches, and rural real estate for sale, Pasco featured the most land for sale. Franklin County is Washington's 27th biggest county (1,264 square miles). It's located in the Eastern Washington region of the state.