Home Postcode finder WA Breton Bay Breton Bay postcode WA Breton Bay is a locality in Western Australia covered by postcode 6043. Postcode 6043 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Breton Bay business listing Be the first listing in Breton Bay Common questionsWhat is the postcode for Breton Bay?Breton Bay, WA has the postcode 6043.What state is Breton Bay in?Breton Bay is in Western Australia (WA).Does postcode 6043 cover more than one suburb?Yes. Postcode 6043 covers 2 localities, so the postcode alone does not identify Breton Bay. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.