Home Postcodes by state QLD 4013 Postcode 4013 4013 is the postcode for Northgate, QLD. Localities with postcode 4013NorthgateQLD Postcode 4013 State or territory Queensland (QLD) Localities 1 Council area Brisbane Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4012 · Postcode 4014