Home Postcodes by state WA 6064 Postcode 6064 6064 is the postcode for 4 localities in WA: Alexander Heights, Girrawheen, Koondoola and Marangaroo. Localities with postcode 6064Alexander HeightsWAGirrawheenWAKoondoolaWAMarangarooWA Postcode 6064 State or territory Western Australia (WA) Localities 4 Council area Wanneroo Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6063 · Postcode 6065