Home Postcodes by state QLD 4746 Postcode 4746 4746 is the postcode for 2 localities in QLD: May Downs and Middlemount. Localities with postcode 4746May DownsQLDMiddlemountQLD Postcode 4746 State or territory Queensland (QLD) Localities 2 Council area Isaac Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4745 · Postcode 4750