Home Postcodes by state QLD 4600 Postcode 4600 4600 is the postcode for 5 localities in QLD: Black Snake, Cinnabar, Kilkivan, Mudlo and Oakview. Localities with postcode 4600Black SnakeQLDCinnabarQLDKilkivanQLDMudloQLDOakviewQLD Postcode 4600 State or territory Queensland (QLD) Localities 5 Council area Gympie Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4581 · Postcode 4601