Home Postcodes by state QLD 4381 Postcode 4381 4381 is the postcode for 2 localities in QLD: Fletcher and Glen Aplin. Localities with postcode 4381FletcherQLDGlen AplinQLD Postcode 4381 State or territory Queensland (QLD) Localities 2 Council area Southern Downs Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 4380 · Postcode 4382