Home Postcodes by state QLD 4020 Postcode 4020 4020 is the postcode for 4 localities in QLD: Newport, Redcliffe, Redcliffe North and Scarborough. Localities with postcode 4020NewportQLDRedcliffeQLDRedcliffe NorthQLDScarboroughQLD Postcode 4020 State or territory Queensland (QLD) Localities 4 Council area Moreton Bay Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4019 · Postcode 4021