Home Postcodes by state WA 6505 Postcode 6505 6505 is the postcode for Wannamal, WA. Localities with postcode 6505WannamalWA Postcode 6505 State or territory Western Australia (WA) Localities 1 Council area Chittering Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6504 · Postcode 6506