Home Postcodes by state WA 6165 Postcode 6165 6165 is the postcode for 2 localities in WA: Hope Valley and Naval Base. Localities with postcode 6165Hope ValleyWANaval BaseWA Postcode 6165 State or territory Western Australia (WA) Localities 2 Council area Kwinana Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6164 · Postcode 6166