Home Postcodes by state TAS 7178 Postcode 7178 7178 is the postcode for Murdunna, TAS. Localities with postcode 7178MurdunnaTAS Postcode 7178 State or territory Tasmania (TAS) Localities 1 Council area Tasman Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 7177 · Postcode 7179