Home Postcodes by state WA 6409 Postcode 6409 6409 is the postcode for 3 localities in WA: North Tammin, South Tammin and Tammin. Localities with postcode 6409North TamminWASouth TamminWATamminWA Postcode 6409 State or territory Western Australia (WA) Localities 3 Council area Tammin Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6407 · Postcode 6410