Home Postcode finder WA Frenchman Bay Frenchman Bay postcode WA Frenchman Bay is a locality in Western Australia covered by postcode 6330. Postcode 6330 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Frenchman Bay business listing Be the first listing in Frenchman Bay Common questionsWhat is the postcode for Frenchman Bay?Frenchman Bay, WA has the postcode 6330.What state is Frenchman Bay in?Frenchman Bay is in Western Australia (WA).Does postcode 6330 cover more than one suburb?Yes. Postcode 6330 covers 50 localities, so the postcode alone does not identify Frenchman Bay. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.