Home Postcode finder SA Morchard Morchard postcode SA Morchard 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 Morchard business listing Be the first listing in Morchard Common questionsWhat is the postcode for Morchard?Morchard, SA has the postcode 5431.What state is Morchard in?Morchard 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 Morchard. Browse other postcodes in South Australia, or widen the search to every Australian postcode.