Home Postcodes by state QLD 4720 Postcode 4720 4720 is the postcode for 2 localities in QLD: Emerald and Yamala. Localities with postcode 4720EmeraldQLDYamalaQLD Postcode 4720 State or territory Queensland (QLD) Localities 2 Council area Central Highlands Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4719 · Postcode 4721