Home Postcodes by state QLD 4858 Postcode 4858 4858 is the postcode for 6 localities in QLD: Comoon Loop, Etty Bay, Martyville, Mourilyan, Mourilyan Harbour and New Harbourline. Localities with postcode 4858Comoon LoopQLDEtty BayQLDMartyvilleQLDMourilyanQLDMourilyan HarbourQLDNew HarbourlineQLD Postcode 4858 State or territory Queensland (QLD) Localities 6 Council area Cassowary Coast Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4857 · Postcode 4859