Home Postcode finder WA Port Denison Port Denison postcode WA Port Denison is a locality in Western Australia covered by postcode 6525. Postcode 6525 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free Port Denison business listing Be the first listing in Port Denison Common questionsWhat is the postcode for Port Denison?Port Denison, WA has the postcode 6525.What state is Port Denison in?Port Denison is in Western Australia (WA).Does postcode 6525 cover more than one suburb?Yes. Postcode 6525 covers 12 localities, so the postcode alone does not identify Port Denison. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.