Home Postcode finder SA Tunkalilla Tunkalilla postcode SA Tunkalilla is a locality in South Australia covered by postcode 5203. Postcode 5203 State or territory South Australia (SA) Region Adelaide Add a free Tunkalilla business listing Be the first listing in Tunkalilla Common questionsWhat is the postcode for Tunkalilla?Tunkalilla, SA has the postcode 5203.What state is Tunkalilla in?Tunkalilla is in South Australia (SA).Does postcode 5203 cover more than one suburb?Yes. Postcode 5203 covers 6 localities, so the postcode alone does not identify Tunkalilla. Browse other postcodes in South Australia, or widen the search to every Australian postcode.