Home Postcode finder WA Coonabidgee Coonabidgee postcode WA Coonabidgee is a locality in Western Australia covered by postcode 6503. Postcode 6503 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free Coonabidgee business listing Be the first listing in Coonabidgee Common questionsWhat is the postcode for Coonabidgee?Coonabidgee, WA has the postcode 6503.What state is Coonabidgee in?Coonabidgee is in Western Australia (WA).Does postcode 6503 cover more than one suburb?Yes. Postcode 6503 covers 20 localities, so the postcode alone does not identify Coonabidgee. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.