Home Postcodes by state QLD 4122 Postcode 4122 4122 is the postcode for 5 localities in QLD: Mansfield, Mount Gravatt, Mount Gravatt East, Upper Mount Gravatt and Wishart. Localities with postcode 4122MansfieldQLDMount GravattQLDMount Gravatt EastQLDUpper Mount GravattQLDWishartQLD Postcode 4122 State or territory Queensland (QLD) Localities 5 Council area Brisbane Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4121 · Postcode 4123