Home Postcodes by state QLD 4312 Postcode 4312 4312 is the postcode for 13 localities in QLD: Bryden, Caboonbah, Coal Creek, Crossdale, Esk, Eskdale and 7 more. Localities with postcode 4312BrydenQLDCaboonbahQLDCoal CreekQLDCrossdaleQLDEskQLDEskdaleQLDGlen EskQLDMoombraQLDMount ByronQLDMount HallenQLDMurrumbaQLDRedbank CreekQLDSomerset DamQLD Postcode 4312 State or territory Queensland (QLD) Localities 13 Council area Somerset Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4311 · Postcode 4313