Home Postcodes by state QLD 4891 Postcode 4891 4891 is the postcode for Karumba, QLD. Localities with postcode 4891KarumbaQLD Postcode 4891 State or territory Queensland (QLD) Localities 1 Council area Carpentaria Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4890 · Postcode 4895