Home Postcodes by state WA 6221 Postcode 6221 6221 is the postcode for 2 localities in WA: Mornington and Wokalup. Localities with postcode 6221MorningtonWAWokalupWA Postcode 6221 State or territory Western Australia (WA) Localities 2 Council area Harvey Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6220 · Postcode 6223