Home Postcodes by state WA 6630 Postcode 6630 6630 is the postcode for 8 localities in WA: Devils Creek, Mullewa, Murchison, Nerramyne, Nunierra, West Casuarinas and 2 more. Localities with postcode 6630Devils CreekWAMullewaWAMurchisonWANerramyneWANunierraWAWest CasuarinasWAWongoondyWAWoolgorongWA Postcode 6630 State or territory Western Australia (WA) Localities 8 Council area Greater Geraldton; Murchison Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6628 · Postcode 6631