Home Postcodes by state QLD 4509 Postcode 4509 4509 is the postcode for 2 localities in QLD: Mango Hill and North Lakes. Localities with postcode 4509Mango HillQLDNorth LakesQLD Postcode 4509 State or territory Queensland (QLD) Localities 2 Council area Moreton Bay Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4508 · Postcode 4510