Home Postcodes by state TAS 7171 Postcode 7171 7171 is the postcode for 2 localities in TAS: Midway Point and Penna. Localities with postcode 7171Midway PointTASPennaTAS Postcode 7171 State or territory Tasmania (TAS) Localities 2 Council area Sorell Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 7170 · Postcode 7172