Home Postcode finder SA Mullaquana Mullaquana postcode SA Mullaquana is a locality in South Australia covered by postcode 5600. Postcode 5600 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Mullaquana business listing Be the first listing in Mullaquana Common questionsWhat is the postcode for Mullaquana?Mullaquana, SA has the postcode 5600.What state is Mullaquana in?Mullaquana is in South Australia (SA).Does postcode 5600 cover more than one suburb?Yes. Postcode 5600 covers 13 localities, so the postcode alone does not identify Mullaquana. Browse other postcodes in South Australia, or widen the search to every Australian postcode.