Home Postcode finder SA Coomooroo Coomooroo postcode SA Coomooroo is a locality in South Australia covered by postcode 5431. Postcode 5431 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Coomooroo business listing Be the first listing in Coomooroo Common questionsWhat is the postcode for Coomooroo?Coomooroo, SA has the postcode 5431.What state is Coomooroo in?Coomooroo is in South Australia (SA).Does postcode 5431 cover more than one suburb?Yes. Postcode 5431 covers 14 localities, so the postcode alone does not identify Coomooroo. Browse other postcodes in South Australia, or widen the search to every Australian postcode.