Home Postcodes by state QLD 4031 Postcode 4031 4031 is the postcode for 2 localities in QLD: Gordon Park and Kedron. Localities with postcode 4031Gordon ParkQLDKedronQLD Postcode 4031 State or territory Queensland (QLD) Localities 2 Council area Brisbane Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4030 · Postcode 4032