Home Postcodes by state QLD 4557 Postcode 4557 4557 is the postcode for 2 localities in QLD: Mooloolaba and Mountain Creek. Localities with postcode 4557MooloolabaQLDMountain CreekQLD Postcode 4557 State or territory Queensland (QLD) Localities 2 Council area Sunshine Coast Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4556 · Postcode 4558