Home Postcodes by state QLD 4400 Postcode 4400 4400 is the postcode for Kingsthorpe, QLD. Localities with postcode 4400KingsthorpeQLD Postcode 4400 State or territory Queensland (QLD) Localities 1 Council area Toowoomba Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4390 · Postcode 4401