Home Postcodes by state WA 6628 Postcode 6628 6628 is the postcode for Tardun, WA. Localities with postcode 6628TardunWA Postcode 6628 State or territory Western Australia (WA) Localities 1 Council area Greater Geraldton Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6627 · Postcode 6630