Home Postcodes by state WA 6525 Postcode 6525 6525 is the postcode for 12 localities in WA: Allanooka, Arrowsmith, Bonniefield, Bookara, Dongara, Irwin and 6 more. Localities with postcode 6525AllanookaWAArrowsmithWABonniefieldWABookaraWADongaraWAIrwinWAMiloWAMount AdamsWAMount HornerWAPort DenisonWASpringfieldWAYardarinoWA Postcode 6525 State or territory Western Australia (WA) Localities 12 Council area Irwin Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6522 · Postcode 6528