Home Postcodes by state SA 5306 Postcode 5306 5306 is the postcode for Wynarka, SA. Localities with postcode 5306WynarkaSA Postcode 5306 State or territory South Australia (SA) Localities 1 Council area Karoonda East Murray Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5304 · Postcode 5307