Home Postcodes by state QLD 4404 Postcode 4404 4404 is the postcode for 4 localities in QLD: Bowenville, Formartin, Irvingdale and Wainui. Localities with postcode 4404BowenvilleQLDFormartinQLDIrvingdaleQLDWainuiQLD Postcode 4404 State or territory Queensland (QLD) Localities 4 Council area Toowoomba; Mainly Western Downs, partly Toowoomba Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4403 · Postcode 4405