Home Postcodes by state QLD 4354 Postcode 4354 4354 is the postcode for 3 localities in QLD: Douglas, Goombungee and Kilbirnie. Localities with postcode 4354DouglasQLDGoombungeeQLDKilbirnieQLD Postcode 4354 State or territory Queensland (QLD) Localities 3 Council area Toowoomba Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4353 · Postcode 4355