Home Postcodes by state QLD 4621 Postcode 4621 4621 is the postcode for 11 localities in QLD: Biggenden, Boompa, Coalstoun Lakes, Coringa, Dallarnil, Degilbo and 5 more. Localities with postcode 4621BiggendenQLDBoompaQLDCoalstoun LakesQLDCoringaQLDDallarnilQLDDegilboQLDDidcotQLDGolden FleeceQLDLakesideQLDWaterangaQLDWoowoongaQLD Postcode 4621 State or territory Queensland (QLD) Localities 11 Council area North Burnett; Fraser Coast Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4620 · Postcode 4625