Home Postcodes by state SA 5724 Postcode 5724 5724 is the postcode for 2 localities in SA: Marla and Mintabie. Localities with postcode 5724MarlaSAMintabieSA Postcode 5724 State or territory South Australia (SA) Localities 2 Council area Unincorporated SA Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5723 · Postcode 5725