Home Postcodes by state QLD 4401 Postcode 4401 4401 is the postcode for 16 localities in QLD: Acland, Aubigny, Balgowan, Biddeston, Boodua, Devon Park and 10 more. Localities with postcode 4401AclandQLDAubignyQLDBalgowanQLDBiddestonQLDBooduaQLDDevon ParkQLDGreenwoodQLDHighland PlainsQLDKelvinhaughQLDMount IrvingQLDMulduQLDOakeyQLDRosalie PlainsQLDSabineQLDSilverleighQLDYargullenQLD Postcode 4401 State or territory Queensland (QLD) Localities 16 Council area Toowoomba Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4400 · Postcode 4402