Home Postcodes by state SA 5203 Postcode 5203 5203 is the postcode for 6 localities in SA: Bald Hills, Parawa, Torrens Vale, Tunkalilla, Wattle Flat and Yankalilla. Localities with postcode 5203Bald HillsSAParawaSATorrens ValeSATunkalillaSAWattle FlatSAYankalillaSA Postcode 5203 State or territory South Australia (SA) Localities 6 Council area Yankalilla Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5202 · Postcode 5204