Home Postcodes by state WA 6220 Postcode 6220 6220 is the postcode for 6 localities in WA: Cookernup, Harvey, Hoffman, Myalup, Uduc and Warawarrup. Localities with postcode 6220CookernupWAHarveyWAHoffmanWAMyalupWAUducWAWarawarrupWA Postcode 6220 State or territory Western Australia (WA) Localities 6 Council area Harvey Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6218 · Postcode 6221