Home Postcodes by state WA 6368 Postcode 6368 6368 is the postcode for South Kumminin, WA. Localities with postcode 6368South KummininWA Postcode 6368 State or territory Western Australia (WA) Localities 1 Council area Narembeen Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6367 · Postcode 6369