Home Postcodes by state QLD 4108 Postcode 4108 4108 is the postcode for 2 localities in QLD: Archerfield and Coopers Plains. Localities with postcode 4108ArcherfieldQLDCoopers PlainsQLD Postcode 4108 State or territory Queensland (QLD) Localities 2 Council area Brisbane Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4107 · Postcode 4109