Home Postcode finder WA Christmas Island Christmas Island postcode WA Christmas Island is a locality in Western Australia covered by postcode 6798. Postcode 6798 State or territory Western Australia (WA) Region North West Suburbs Add a free Christmas Island business listing More business listings in Christmas Island Businesses in Christmas IslandChristmas Island District SchoolMurray Road · 08 91648546 Common questionsWhat is the postcode for Christmas Island?Christmas Island, WA has the postcode 6798.What state is Christmas Island in?Christmas Island is in Western Australia (WA).Does postcode 6798 cover more than one suburb?No. Postcode 6798 covers Christmas Island only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.