Home Postcodes by state QLD 4717 Postcode 4717 4717 is the postcode for Blackwater, QLD. Localities with postcode 4717BlackwaterQLD Postcode 4717 State or territory Queensland (QLD) Localities 1 Council area Central Highlands Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4716 · Postcode 4718