Home Postcodes by state SA 5270 Postcode 5270 5270 is the postcode for 6 localities in SA: Buckingham, Carew, Kongal, Mundulla, Mundulla West and Swede Flat. Localities with postcode 5270BuckinghamSACarewSAKongalSAMundullaSAMundulla WestSASwede FlatSA Postcode 5270 State or territory South Australia (SA) Localities 6 Council area Tatiara Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5269 · Postcode 5271