Home Postcodes by state QLD 4000 Postcode 4000 4000 is the postcode for 6 localities in QLD: Brisbane, Brisbane City, Brisbane Gpo, Petrie Terrace, Spring Hill and Brisbane Adelaide Street. Localities with postcode 4000BrisbaneQLDBrisbane Adelaide StreetQLDBrisbane CityQLDBrisbane GpoQLDPetrie TerraceQLDSpring HillQLD Postcode 4000 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 3996 · Postcode 4005