Home Postcodes by state WA 6288 Postcode 6288 6288 is the postcode for 7 localities in WA: Alexandra Bridge, Courtenay, Hamelin Bay, Karridale, Nillup, Scott River and 1 more. Localities with postcode 6288Alexandra BridgeWACourtenayWAHamelin BayWAKarridaleWANillupWAScott RiverWAWarner GlenWA Postcode 6288 State or territory Western Australia (WA) Localities 7 Council area Augusta Margaret River Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6286 · Postcode 6290