Home Postcodes by state QLD 4051 Postcode 4051 4051 is the postcode for 6 localities in QLD: Alderley, Enoggera, Gaythorne, Grange, Newmarket and Wilston. Localities with postcode 4051AlderleyQLDEnoggeraQLDGaythorneQLDGrangeQLDNewmarketQLDWilstonQLD Postcode 4051 State or territory Queensland (QLD) Localities 6 Council area Brisbane Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4037 · Postcode 4053