Home Postcodes by state QLD 4503 Postcode 4503 4503 is the postcode for 6 localities in QLD: Dakabin, Griffin, Kallangur, Kurwongbah, Murrumba Downs and Whiteside. Localities with postcode 4503DakabinQLDGriffinQLDKallangurQLDKurwongbahQLDMurrumba DownsQLDWhitesideQLD Postcode 4503 State or territory Queensland (QLD) Localities 6 Council area Moreton Bay Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4502 · Postcode 4504