Home Postcode finder SA Coffin Bay Coffin Bay postcode SA Coffin Bay is a locality in South Australia covered by postcode 5607. Postcode 5607 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Coffin Bay business listing Be the first listing in Coffin Bay Common questionsWhat is the postcode for Coffin Bay?Coffin Bay, SA has the postcode 5607.What state is Coffin Bay in?Coffin Bay is in South Australia (SA).Does postcode 5607 cover more than one suburb?Yes. Postcode 5607 covers 50 localities, so the postcode alone does not identify Coffin Bay. Browse other postcodes in South Australia, or widen the search to every Australian postcode.