Home Postcodes by state WA 6799 Postcode 6799 6799 is the postcode for 2 localities in WA: Home Island Cocos (Keeling) Islands and West Island Cocos (Keeling) Islands. Localities with postcode 6799Home Island Cocos (Keeling) IslandsWAWest Island Cocos (Keeling) IslandsWA Postcode 6799 State or territory Western Australia (WA) Localities 2 Postcode 6798 · Postcode 7000