Home Postcodes by state QLD 4728 Postcode 4728 4728 is the postcode for 4 localities in QLD: Dunrobin, Garfield, Jericho and Mexico. Localities with postcode 4728DunrobinQLDGarfieldQLDJerichoQLDMexicoQLD Postcode 4728 State or territory Queensland (QLD) Localities 4 Council area Barcaldine Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4727 · Postcode 4730