Home Postcodes by state NSW 4375 Postcode 4375 4375 is the postcode for 3 localities in NSW and QLD: Cottonvale, Cottonvale and Fleurbaix. Localities with postcode 4375CottonvaleNSW 4375CottonvaleQLD 4375FleurbaixQLD 4375 Postcode 4375 State or territory New South Wales (NSW) and Queensland (QLD) Localities 3 Council area Tenterfield; Southern Downs Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4374 · Postcode 4376