Home Postcodes by state WA 6397 Postcode 6397 6397 is the postcode for Rocky Gully, WA. Localities with postcode 6397Rocky GullyWA Postcode 6397 State or territory Western Australia (WA) Localities 1 Council area Plantagenet Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6396 · Postcode 6398