Home Postcodes by state SA 5303 Postcode 5303 5303 is the postcode for Parilla, SA. Localities with postcode 5303ParillaSA Postcode 5303 State or territory South Australia (SA) Localities 1 Council area Southern Mallee Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5302 · Postcode 5304