Home Postcodes by state QLD 4751 Postcode 4751 4751 is the postcode for 4 localities in QLD: Greenmount, Palmyra, Victoria Plains and Walkerston. Localities with postcode 4751GreenmountQLDPalmyraQLDVictoria PlainsQLDWalkerstonQLD Postcode 4751 State or territory Queensland (QLD) Localities 4 Council area Mackay Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4750 · Postcode 4753