Home Postcodes by state SA 5471 Postcode 5471 5471 is the postcode for Gulnare, SA. Localities with postcode 5471GulnareSA Postcode 5471 State or territory South Australia (SA) Localities 1 Council area Northern Areas Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5470 · Postcode 5472