Home Postcode finder WA Middleton Beach Middleton Beach postcode WA Middleton Beach 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 Middleton Beach business listing Be the first listing in Middleton Beach Common questionsWhat is the postcode for Middleton Beach?Middleton Beach, WA has the postcode 6330.What state is Middleton Beach in?Middleton Beach 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 Middleton Beach. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.