Home Postcodes by state QLD 4735 Postcode 4735 4735 is the postcode for 4 localities in QLD: Diamantina Lakes, Middleton, Opalton and Winton. Localities with postcode 4735Diamantina LakesQLDMiddletonQLDOpaltonQLDWintonQLD Postcode 4735 State or territory Queensland (QLD) Localities 4 Council area Diamantina; Winton Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4733 · Postcode 4736