Home Postcodes by state SA 5234 Postcode 5234 5234 is the postcode for Birdwood, SA. Localities with postcode 5234BirdwoodSA Postcode 5234 State or territory South Australia (SA) Localities 1 Council area Adelaide Hills Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5233 · Postcode 5235